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As the urgency to limit global warming has intensified, negative emissions technology such as direct air capture and carbon sequestration are increasingly considered in climate mitigation scenarios. When Iceland opened the commercial-grade direct air carbon capture and storage (DACCS) facility in 2021, this marked a breakthrough for DACCS technology as a scalable climate mitigation solution. This study investigates the adoption of DACCS in Iceland and the potential for diffusion into other contexts as a global decarbonization solution. We implement expert interviews to analyze the adoption of technology, and to identify the various requirements of scaling DACCS into local and global contexts. Using inductive thematic analysis, we characterize the diverging perspectives on the role of carbon dioxide removal as a climate mitigation solution and also identify pathways toward technology upscaling at national, regional, and global scales. Despite the successful technology demonstration of DACCS, we find that experts hold different mental models of climate mitigation generally, characterized as "nature vs. technology." We also find that experts clearly articulate the necessary conditions for the diffusion of DACCS more broadly, including explicit regulatory measures as guardrails against a "license to pollute" as well as bilateral governance structures that include financial investment. Finally, we find that the importance of public acceptance of the technology was noted among all expert groups. Limited data exist on the acceptance of DACCS paired with renewable energy and this is a future research recommendation. [ABSTRACT FROM AUTHOR]

Soil amendments are a broad class of materials that enhance physical, chemical or biological characteristics in croplands, pastures, or rangelands. While organic soil amendments such as manure, mulch and seaweed have well established agronomic benefits, there has been renewed private and governmental interest in quantifying and incentivizing their role in mitigating climate change. Likewise, biostimulants and biopesticides, which are intended to target specific plant or microbial processes, are emerging with claims of improved soil health, crop yields, soil organic carbon sequestration, and greenhouse gas emission reductions. We conducted a literature review to address the climate mitigation potential of organic soil amendments, including biostimulants and biopesticides. In doing so, we identify three elements of climate mitigation through the use of soil amendments: soil organic carbon sequestration, soil greenhouse gas emission reductions, and life cycle emission reductions. We review common soil amendment classes in detail, addressing the empirical evidence (or lack thereof) in which they meet these three elements of climate mitigation. We conclude by suggesting priorities for government and private investment. [ABSTRACT FROM AUTHOR]

The electronics industry has made remarkable progress over the past 25 years in reducing the emission intensity of long-lived volatile fluorinated compounds (FCs) that typically represent 80 to 90% of uncontrolled direct (scope 1) greenhouse gas (GHG) emissions during the manufacturing of semiconductor, display, and photovoltaic devices. However, while Normalized Emission Rates (NERs) have decreased in terms of CO2-equivalent emissions per surface area of electronic devices produced, absolute FC emissions from the sector have continued to grow at a compound annual rate of 3.4% between 1995 and 2020. Despite these trends, industry has not, to date, renewed their sectoral commitments to strengthen global FC emission reduction goals for the 2020–2030 decade, and it is unlikely that recently announced net-zero emission objectives from a few leading companies can reverse upwards industry emission trends in the near-term. Meanwhile, the persisting gap between "top-down" atmospheric measurements-based FC emission estimates and "bottom-up" emissions estimates is increasingly concerning as recent studies suggest that the gap is likely due, in part, to an underestimation of FC emissions from the electronics sector. Thus, the accuracy of industry-average (Tier 2) emission factors is increasingly questionable. Considering that most FCs essentially permanently persist in the atmosphere on a human time scale, the electronics industry needs to reassert its collective leadership on climate action, increase its ambition to reduce absolute emissions, and ground net-zero commitments in science by embarking on a concerted effort to monitor, report, and verify their process and abatement emission factors. To this effect, this article provides practicable solutions to cross-check bottom-up and top-down emission factors at the facility level and suggests that further implementing cost-effective FC abatement technologies, possibly in conjunction with a sectoral cap-and-trade mechanism, can help achieve residual FC emission levels compatible with net-zero neutralization principles and the 1.5 °C objective of the Paris Agreement. [ABSTRACT FROM AUTHOR]

The livestock sector in low- and middle-income countries could contribute significantly to reduce the rate of growth and/or the level of greenhouse gas (GHG) emissions required to achieve the 1.5 °C target of the Paris Agreement. Yet, the sector is also expected to contribute to food and income security in these countries. Using an extensive dataset on the Ethiopian livestock sector, we assessed the potential of selected interventions to increase supply of animal source protein (ASP) and reduce GHG emissions intensity or absolute emissions at national level. The business as usual (BAU) scenario was modelled by extrapolating the historical trends observed during the base years (i.e. 2010 – 2020) to the period between 2021 and 2030. Four scenarios were modelled including structural changes in cattle herd (S1) and chicken flock (S3) composition, increased milk yields of dairy cattle (S2), and a combination of all strategies (S4). We found that the total ASP produced and supplied per capita, as well as total GHG emissions increased between 2021 and 2030 across all scenarios while emission intensities per unit ASP produced decreased. However, by 2030, the total GHG emissions in S1 (i.e. 146.7 MtCO2e) were lower than in the BAU scenario (i.e. 149.0 MtCO2e) while the total ASP supplied per capita was higher in the former (i.e. 6.84 kg) than the latter (i.e. 6.24 kg). These findings suggest that structural changes at herd level could reduce total GHG emissions and concomitantly increase ASP supply. Therefore, structural transformation could be a highly relevant policy option for low- and middle- income countries, where the livestock sector must address multiple goals including food and income security, and global climate commitments. [ABSTRACT FROM AUTHOR]

As the loss of forests over time results in a net flux of carbon (C) into the atmosphere, the practice of agroforestry can combat this and serve as a long-term sink for CO2. Based on the inventory of 93 homegarden agroforestry systems (AFS) in three study sites and using a non-destructive method involving allometric equations, the research assessed aboveground (AG) and belowground (BG) biomass and biomass C stocks across sites and along age groups in homegarden AFS in southern and southwestern Ethiopia. Plant diversity parameters were also gathered on perennial plant species. Results indicate that the mean perennial plant species richness per homegarden agroforestry, and other diversity parameters varied strongly among sites (p < 0.05). Biomass C stocks range from 18.11 at Malo Ezo to 32.86 Mg C ha−1 at Saja Laften for AG, 3.97 to 7.10 Mg C ha−1 for BG, and 22.02 to 39.96 Mg C ha−1, for each respective sites, for the overall biomass C stocks were recorded within the homegarden agroforestry systems. In terms of age groups, the mean total biomass C stock did show numerical change from the initial, ≤10 years (22.49 Mg C ha−1) to the middle age group, >10 and ≤20 years (39.96 Mg C ha−1), but it was stagnant 20 years onward (28.49 Mg C ha−1). The homegarden agroforestry systems had the potential to store up to 80.81–112.30 Mg·ha−1 of CO2 equivalents across sites, and 82.53–104.55 Mg·ha−1 of CO2 equivalents along age groups. A positive relationship was noted between AG woody biomass C stocks and attributes such as woody species richness, and woody plant density. Considering the involvement of large numbers of homegardeners, future improvements and expansion of homegarden agroforestry to larger areas can enhance to a great extent the potential to sequester C and thereby mitigate climate change. [ABSTRACT FROM AUTHOR]

Soils have the potential to sequester and store significant amounts of carbon, contributing towards climate change mitigation. Soil carbon markets are emerging to pay farmers for management changes that absorb atmospheric carbon, governed by codes that ensure eligibility, additionality and permanence whilst protecting against leakage and reversals. This paper presents the first global comparative analysis of farmland soil carbon codes, providing new insights into the range of approaches governing this global marketplace. To do this, the paper developed an analytical framework for the systematic comparison of codes which was used to identify commonalities and differences in approaches, methods, administration, commercialisation and operations for 12 publicly available codes from around the world. Codes used a range of mechanisms to manage additionality, uncertainty and risks, baselines, measurement, reporting and verification, auditing, resale of carbon units, bundling and stacking, stakeholder engagement and market integrity. The paper concludes by discussing existing approaches and codes that could be adapted for use in the UK and evaluates the need for an over-arching standard for soil carbon codes in the UK and internationally, to which existing codes and other schemes already generating soil carbon credits could be assessed and benchmarked. [ABSTRACT FROM AUTHOR]

Cement is one of the highest energy-consuming and emission generating industries around the world. To reduce greenhouse emissions, several mitigation measures have been proposed, and their effectiveness is estimated. However, estimates of the global temperature change potential of the cement industry have seldom been performed. Hence, in this study, we propose a new framework that estimates CO2 emissions and other seven pollutants to estimate temperature change potential from the cement industry. The underlying framework uses system dynamics, where the effectiveness of four mitigation measures, i.e., a shift in demand, newer methodologies to produce clinker, use of energy efficiency improvements, and implementation of renewable energy, are explored. The results indicate that renewable sources of energy show highest mitigation potential. The cement industry has contributed to an increase in 2 mK temperature since 1990, which is likely to grow up to 14.8 mK by 2050 if no mitigation measures are applied. Energy efficiency improvements by extensions of perform achieve and trade scheme can reduce 0.33 mK from the Indian cement industry. This paper provides a unique opportunity for estimating temperature influence of the cement industry, which can be further implemented for other countries. [ABSTRACT FROM AUTHOR]

A global warming potential of albedo (GWPA) is proposed, that represents the carbon dioxide emissions equivalent to a 0.01 increase in albedo over 1 m2 of horizontal surface. A survey of prior literature suggests GWPA ≈ −4.2 kgCO2/m2. Taking Los Angeles, CA as a test site for urban global warming mitigation actions, a residential "cool roof" project offers approximately seven times as much radiative forcing benefit from albedo change as from GHG reduction of energy efficiency; and a citywide increase to commercial building roof albedo offers radiative forcing benefit equivalent to the first 6½ years of all commercial sector GHG emission reductions proposed in the City of Los Angeles climate action plan. Discussion explores pathways and challenges to making albedo increases fungible with GHG reductions in GHG markets. [ABSTRACT FROM AUTHOR]

Cement is one of the highest energy-consuming and emission generating industries around the world. To reduce greenhouse emissions, several mitigation measures have been proposed, and their effectiveness is estimated. However, estimates of the global temperature change potential of the cement industry have seldom been performed. Hence, in this study, we propose a new framework that estimates CO2 emissions and other seven pollutants to estimate temperature change potential from the cement industry. The underlying framework uses system dynamics, where the effectiveness of four mitigation measures, i.e., a shift in demand, newer methodologies to produce clinker, use of energy efficiency improvements, and implementation of renewable energy, are explored. The results indicate that renewable sources of energy show highest mitigation potential. The cement industry has contributed to an increase in 2 mK temperature since 1990, which is likely to grow up to 14.8 mK by 2050 if no mitigation measures are applied. Energy efficiency improvements by extensions of perform achieve and trade scheme can reduce 0.33 mK from the Indian cement industry. This paper provides a unique opportunity for estimating temperature influence of the cement industry, which can be further implemented for other countries.

As the loss of forests over time results in a net flux of carbon (C) into the atmosphere, the practice of agroforestry can combat this and serve as a long-term sink for CO2. Based on the inventory of 93 homegarden agroforestry systems (AFS) in three study sites and using a non-destructive method involving allometric equations, the research assessed aboveground (AG) and belowground (BG) biomass and biomass C stocks across sites and along age groups in homegarden AFS in southern and southwestern Ethiopia. Plant diversity parameters were also gathered on perennial plant species. Results indicate that the mean perennial plant species richness per homegarden agroforestry, and other diversity parameters varied strongly among sites (p 10 and ≤20 years (39.96 Mg C ha−1), but it was stagnant 20 years onward (28.49 Mg C ha−1). The homegarden agroforestry systems had the potential to store up to 80.81–112.30 Mg·ha−1 of CO2 equivalents across sites, and 82.53–104.55 Mg·ha−1 of CO2 equivalents along age groups. A positive relationship was noted between AG woody biomass C stocks and attributes such as woody species richness, and woody plant density. Considering the involvement of large numbers of homegardeners, future improvements and expansion of homegarden agroforestry to larger areas can enhance to a great extent the potential to sequester C and thereby mitigate climate change.

Though livestock are one of the major contributors to climate change through emission of greenhouse gases (GHG), the intensity of emission and the mitigation potential from this sector is not clearly known in the study regions. Therefore, the present study was designed to estimate the emission of GHGs from the livestock sector over the time period (2003/04–2017/18) and evaluate the mitigation potential using the global livestock environment assessment model (GLEAM). Both primary and secondary data sources were used to obtain data on livestock population, herd parameters, feeding practices, and manure management. The study revealed an increasing trend of GHG from 2003/04 to 2017/18, where the annual emission increased with an average 3.8 Mt carbon dioxide equivalent (CO2-eq) for all species and 3.3 Mt CO2-eq for cattle alone at national level. Though there is some variation between regions, methane (CH4) was the major gas emitted from ruminant production followed by nitrous oxide (N2O), however the emission of N2O was higher (> 70%) in poultry production. The emission intensity from chicken egg and meat, 1.8–3.3 and 2.2–7.2 kg CO2-eq/kg of product, respectively, was much lower than the emission intensity of meat from small ruminants (16.4–51.5 kg CO2-eq/kg of product) and cattle (34.2–148.2 kg CO2-eq/kg of product). Implementing the integrated mitigation approach has much pronounced reduction effect on GHG emissions as well as increasing the productivity of the livestock sector. Unless mitigation measures are taken, the sector's emission will increase over time. Thus, federal and regional governments, and partner organizations working in the sector need to give more attention and implement the initiatives identified in the Climate Resilient Green Economy (CRGE) strategy and Food and Agriculture Organization of the United Nations (FAO) recommendations to mitigate GHG emissions from the livestock sector. [ABSTRACT FROM AUTHOR]

The Paris Agreement calls on all nations to pursue efforts to contribute to limiting the global temperature increase to 1.5 °C above pre-industrial levels. However, due to limited global, regional and country-specific analysis of highly ambitious GHG mitigation pathways, there is currently a lack of knowledge about the transformational changes needed in the coming decades to reach this target. Through a meta-analysis of mitigation scenarios for Germany, this article aims to contribute to an improved understanding of the changes needed in the energy system of an industrialized country. Differentiation among six key long-term energy system decarbonization strategies is suggested, and an analysis is presented of how these strategies will be pursued until 2050 in selected technologically detailed energy scenarios for Germany. The findings show, that certain strategies, including the widespread use of electricity-derived synthetic fuels in end-use sectors as well as behavioral changes, are typically applied to a greater extent in mitigation scenarios aiming at high GHG emission reductions compared to more moderate mitigation scenarios. The analysis also highlights that the pace of historical changes observed in Germany between 2000 and 2015 is clearly insufficient to adequately contribute to not only the 1.5 °C target, but also the 2 °C long-term global target.

In order to engage in carbon management at the household level, individuals need to understand how their everyday activities contribute to greenhouse gas emissions, and how they can reduce their personal carbon footprint. This implies a need for ‘carbon literacy’, a term that has emerged in the literature in the last few years without being formally defined. This paper proposes a definition of carbon literacy and compares this with other, related concepts. Next the results of two qualitative studies are presented that reveal how three mechanisms help to increase carbon literacy: energy monitoring; carbon footprint statements; and peer/social learning through sharing information, skills and resources with others. The different aspects of carbon literacy that these mechanisms contribute to are highlighted. Especially notable is the significance of carbon footprint statements, which enable understanding of the relative emissions associated with different activities, and the value many interviewees placed on learning within a group. These two mechanisms enhance the impact of energy monitoring by individuals, which is part of the focus of schemes such as the introduction of ‘smart’ energy meters in several countries. The implications of these findings for policymakers and others who wish to promote carbon literacy are discussed.

Shrublands play an important role in the reduction of atmospheric CO2 and contribute to the mitigation of the effects of climate change, due to their ability to act as carbon sinks and the large expanses of land involved. Two of the most representative shrub species in the Iberian Peninsula, Cistus ladanifer L. and Erica arborea L., were studied in terms of biomass distribution and carbon and nitrogen contents in the different fractions. With a view to fast and cost-effective estimation of radical biomass, a new procedure for easy root-to-shoot calculation based on vibrational data was proposed, resulting in an excellent agreement with the values obtained from conventional direct belowground and aerial biomass measurements: 0.23 for C. ladanifer and 0.54 for E. arborea. Carbon sequestration, estimated at 45 and 73 t CO2 eq·ha−1 for C. ladanifer and E. arborea, respectively, was subsequently determined. Since these values are substantially higher than those of other shrubs, these two key species can be deemed particularly promising for ecological restoration and carbon offsetting.

The objective of this study is to quantify the contribution of the German forestry to climate change mitigation and to calculate the associated costs at the national level. For that, the forest and harvested wood products carbon pools are considered as well as energy and material substitution. We compare five different scenarios, each referring to an alternative level of timber harvests (due to changing rotation lengths or setting aside of forest areas). The study shows that enhancing the use of wood products at the expense of other materials, such as steel, plastic or concrete, can have a substantial impact on the overall carbon balance. [ABSTRACT FROM AUTHOR]

Monitoring and mapping forest carbon is critical for informing climate change mitigation measures. Evidence indicates that forest edges hold less carbon than the forest interior. In this study, using field inventory data from a Chinese fir forest ecosystem in southeast China, the carbon at the forest edge and forest interior at different elevations was measured. The results showed a significant increasing trend in carbon with elevation. The results also revealed that forest edges had significantly lower carbon than the forest interior. Carbon density values varied between 265 Mg C ha−1 at forest edges and 320 Mg C ha−1 at forest interior. The study highlights that ignoring edge effects overestimates carbon density by 9.46%. These findings suggest that edge effects should be given proper consideration during national forest carbon inventory. Furthermore, the authors recommend the establishment of permanent sampling plots along forest edges for precise and accurate carbon accounting. [ABSTRACT FROM AUTHOR]

Negative emissions technologies (NETs) and their potential role in meeting emission targets is a rapidly growing and contentious area of climate change mitigation research. The literature ranges in scope from general reviews of NETs options to research and development through applied case studies. Within this field, a gap exists in the application of this growing body of research to the unique limitations and opportunities of a specific nation. Ireland is a small developed island nation in the EU with a unique emissions profile, as 32% of the total comes from agriculture due to the high number of cattle. In this study we aim to assess the potential capacity of terrestrial NETs options for Ireland and review the nation-specific context for their deployment. Despite the proportionally high representation of biochar and carbon capture and storage in the international NETs research, in an Irish context afforestation and bioenergy crops are much more established practices and could readily be considered in possible emission pathways that use NETs. Higher capacities were found for NETs options that are currently unavailable (direct air carbon capture and storage and bioenergy with carbon capture and storage), while options available to deploy at scale (afforestation, soil carbon management and biochar) have capacities limited by saturation of soil carbon stock and have higher risk of reversibility due to impermanence. Hence, while we estimate a reasonable technical capacity for NETs in Ireland, emission reduction remains the highest priority for feasibly meeting a Paris-aligned carbon quota for Ireland. [ABSTRACT FROM AUTHOR]

The Paris Agreement calls on all nations to pursue efforts to contribute to limiting the global temperature increase to 1.5 °C above pre-industrial levels. However, due to limited global, regional and country-specific analysis of highly ambitious GHG mitigation pathways, there is currently a lack of knowledge about the transformational changes needed in the coming decades to reach this target. Through a meta-analysis of mitigation scenarios for Germany, this article aims to contribute to an improved understanding of the changes needed in the energy system of an industrialized country. Differentiation among six key long-term energy system decarbonization strategies is suggested, and an analysis is presented of how these strategies will be pursued until 2050 in selected technologically detailed energy scenarios for Germany. The findings show, that certain strategies, including the widespread use of electricity-derived synthetic fuels in end-use sectors as well as behavioral changes, are typically applied to a greater extent in mitigation scenarios aiming at high GHG emission reductions compared to more moderate mitigation scenarios. The analysis also highlights that the pace of historical changes observed in Germany between 2000 and 2015 is clearly insufficient to adequately contribute to not only the 1.5 °C target, but also the 2 °C long-term global target. [ABSTRACT FROM AUTHOR]

In order to engage in carbon management at the household level, individuals need to understand how their everyday activities contribute to greenhouse gas emissions, and how they can reduce their personal carbon footprint. This implies a need for ‘carbon literacy’, a term that has emerged in the literature in the last few years without being formally defined. This paper proposes a definition of carbon literacy and compares this with other, related concepts. Next the results of two qualitative studies are presented that reveal how three mechanisms help to increase carbon literacy: energy monitoring; carbon footprint statements; and peer/social learning through sharing information, skills and resources with others. The different aspects of carbon literacy that these mechanisms contribute to are highlighted. Especially notable is the significance of carbon footprint statements, which enable understanding of the relative emissions associated with different activities, and the value many interviewees placed on learning within a group. These two mechanisms enhance the impact of energy monitoring by individuals, which is part of the focus of schemes such as the introduction of ‘smart’ energy meters in several countries. The implications of these findings for policymakers and others who wish to promote carbon literacy are discussed. [ABSTRACT FROM AUTHOR]

Shrublands play an important role in the reduction of atmospheric CO2and contribute to the mitigation of the effects of climate change, due to their ability to act as carbon sinks and the large expanses of land involved. Two of the most representative shrub species in the Iberian Peninsula,Cistus ladaniferL. andErica arboreaL., were studied in terms of biomass distribution and carbon and nitrogen contents in the different fractions. With a view to fast and cost-effective estimation of radical biomass, a new procedure for easy root-to-shoot calculation based on vibrational data was proposed, resulting in an excellent agreement with the values obtained from conventional direct belowground and aerial biomass measurements: 0.23 for C. ladanifer and 0.54 for E. arborea. Carbon sequestration, estimated at 45 and 73 t CO2eq·ha−1forC. ladaniferandE. arborea, respectively, was subsequently determined. Since these values are substantially higher than those of other shrubs, these two key species can be deemed particularly promising for ecological restoration and carbon offsetting. [ABSTRACT FROM AUTHOR]

Agriculture has featured prominently in the UNFCCC technical discussions but is largely absent from the formal negotiation processes. There is also a growing divide between how developed and developing countries frame solutions to the impacts of climate change on agriculture, which is limiting recognition of solutions that integrate mitigation and adaptation opportunities, such as climate-smart agriculture. [ABSTRACT FROM AUTHOR]

Mitigation of climate change via increased plant productivity and soil carbon (C) sequestration during land use change can be a powerful driver of the net greenhouse gas emissions of a sustainable production system. Yet the net climate change mitigation of managed forests is affected by both tradeoffs between C sequestration and non-renewable C emissions and assessment methodology. As a case study, we measured ecosystem stocks to determine the potential C implications of converting pasture to managed eucalyptus forest and compared them with the eucalyptus production system's non-renewable C emissions. The forest border was chosen as the system boundary and operations spanned from forest establishment activities to harvested wood placed at the forest perimeter. Eucalyptus biomass C was 57.2 ± 4.2 Mg C ha−1and soil C stock (to ∼1 m depth) was approximately an order of magnitude greater. By the prevalent method for bulk density-based determination of C stock, conversion of pasture to eucalyptus forest significantly increased soil C stock by 17.5 ± 8.0%. However, no significant change was detected by the equivalent soil mass method, a less prevalent but more accurate approach to detecting differences in soil C stock due to land use or management changes. A 7-year eucalyptus production cycle generated 1.0 Mg C ha−1in non-renewable emissions, which was far exceeded by the tree biomass C. Thus, even without significant soil C sequestration, this system provided a substantial climate change mitigation service by offsetting non-renewable energy use and C emissions associated with wood production, and providing opportunities for biofuel and bioenergy products to displace fossil fuel products. [ABSTRACT FROM AUTHOR]

The transition to a low-carbon society is imperative to climate change mitigation and requires cross-sectoral action at multiple levels. A growing literature emphasizes local action, but less is written about scaling up action at a county level. Combining three analytical perspectives – transition theory, strategic niche management and the middle-out – we examine the evolution and scaling up of local community-scale carbon action in Oxfordshire county. Our analysis is based on four local-level research projects. By identifying the roles and strategies of local actors in the development and scaling up of low carbon innovation and action, we conclude that local meso-level actors are crucial for catalyzing initial stages of county-level transitions, but limited in their capacity to scale up low-carbon innovation. [ABSTRACT FROM PUBLISHER]

Almost two decades since the Kyoto Protocol was adopted, global greenhouse gas emissions are still rising rapidly. We argue that the global climate policy focus on carbon markets has played a significant role in the failure to reduce emissions. There are 16 compliance carbon markets in operation across the world. Many more are planned, although there have been numerous problems with carbon trading, including ineffectiveness, weak regulation and implementation, instances of fraud, little to no emissions reduction and major legitimacy issues for governments and the private sector. In this paper we take a “strong” position, arguing that carbon markets do not have a role to play in a policy scenario that requires radical emissions reductions in order to avoid dangerous greenhouse gas concentrations. We put forward 10 reasons why carbon markets should not be the preferred climate policy choice, which we have collated from positions taken by grassroots social movement organizations, think tanks, NGOs and other political advocacy groups as well as individual scientists and scholars. [ABSTRACT FROM PUBLISHER]

This paper considers the effects of the Camp for Climate Action, or “Climate Camp,” on climate change mitigation and public discourse in the UK on climate change, drawing on participants' views and media coverage in addition to academic sources. Climate Camp was an activist movement best known for summer protest camps in the UK in 2006–2010, which targeted high-profile sources of greenhouse gas emissions, including Heathrow airport and Drax power station; engaged in radical, anti-capitalist critique of climate change; and demonstrated sustainable living. The ongoing effects of Climate Camp on climate change mitigation are analyzed, including specific campaigns, public discourse and mobilization of activists. The paper finds that while specific campaigns were successful and Climate Camp has contributed to a renewal of environmental activism and mobilization of “bystanders,” the movement has (so far) failed to shift public discourse on climate change, let alone effect the deep systemic change it deemed necessary to mitigate climate change. [ABSTRACT FROM PUBLISHER]

One hundred percent renewable energy systems have the potential to mitigate climate change, but large fluctuations in energy supply and demand make ensuring reliability a key challenge. A hypothetical future energy system developed for the UK features reduced total energy demand, increased electrification and 100% renewable and carbon-neutral energy sources. Hourly modelling of this system over a 10-year period shows that even in an integrated energy system there will be significant electricity surpluses and shortfalls. Flexible demand and conventional electricity and heat stores reduced the extremes but could not provide the capacity required. Carbon-neutral synthetic gaseous fuel could provide a flexible and quickly dispatchable back up system, with large storage and generation capacities comparable with those in the UK today. [ABSTRACT FROM AUTHOR]

To radically address the problem of climate change, it is not enough to modify specific attitudes and behaviors while upholding the present paradigms. This article aims to show why modifications will never bring about radical carbon emission reductions. We discuss what it implies to desire radical change, using contemporary philosophy as a method. We argue that a key requirement to achieve radical emission reductions is that we as human beings adopt responsibility that brings with it a continuous commitment to the process of change. Acting on the new understanding of responsibility as an internal mindset toward the bringing about of radical change requires a cooperative decision-making model and a new understanding of leadership. [ABSTRACT FROM AUTHOR]

Background: Since many governments lack the motivation to lead deep emission reduction initiatives, the climate action movement must strengthen its campaigns. Method and results: This paper offers strategies for the movement derived from historical analysis of mechanisms that achieved effective social change in the past. Common elements of climate action with past social change movements, together with some differences, are identified. Conclusion: Although technologies, strategies and tactics vary, climate action groups can agree to support a shared common goal: effective climate mitigation, that can be accomplished not only through outward-oriented tactics, but also by forms of climate activism that are prefigurative – that is, based on action within local communities. Furthermore, the diverse campaigns that take place on a variety of scales and spaces, conducted by heterogeneous groups, should be integrated by establishing national and international hubs to facilitate coordination and communication. [ABSTRACT FROM AUTHOR]

Renewable energies are advancing across many fronts – and now a new front has opened up in the form of dispatchable concentrating solar power (CSP). It is in emerging markets such as China, India and countries in North Africa and the Middle East as well as South America and southern Africa that CSP power plants with 24/7 dispatchable power are starting to be viewed as a viable way forward. The emerging CSP industrial value chain in China, India, southern Africa and elsewhere is expected to exert its consequent dramatic impact on cost reductions, which will in turn drive the diffusion of CSP around the world as a key challenger and alternative to nuclear and fossil fuel power. In this paper, we review these developments and discuss the effects attributable to the emerging learning curve, combined with technology progress involving molten salt heat transfer and reductions in water requirements, as well as patenting trends in the global CSP industry. [ABSTRACT FROM PUBLISHER]

This paper reviews the literature on urban carbon governance, which has become a burgeoning area of research. Since the early 1990s, the field has grown and diversified geographically, theoretically and methodologically, and now encompasses a wide range of topics, including governing techniques, limitations and challenges, central-local relations, municipal networks, network governance and grassroots initiatives. Given the increasingly global nature of low-carbon urbanism and governance, these studies have expanded our knowledge on the complexity and plurality of the role of cities in addressing climate change. This review serves as a consolidated guide for researchers, policymakers and students in this field. [ABSTRACT FROM PUBLISHER]

A Scientific Committee on Problems of the Environment Rapid Assessment (SCOPE-RAP) workshop was held on 18–22 March 2013. This workshop was hosted by the European Commission, JRC Centre at Ispra, Italy, and brought together 40 leading experts from Africa, Asia, Europe and North and South America to create four synthesis chapters aimed at identifying knowledge gaps, research requirements, and policy innovations. Given the forthcoming publication by CABI of a book volume of the outcomes of the SCOPE-RAP in 2014, this workshop report provides an update on the global societal challenge of soil carbon management and some of the main issues and solutions that were identified in the four working sessions. [ABSTRACT FROM PUBLISHER]

Background: Biochar from pyrolysis of biomass amended in soils to improve nitrogen use efficiency for enhancing crop productivity and mitigate climate change in agriculture has been well documented. However, application for soil amendment of biochar at high rates could be challenged with cost-effectiveness for small-scale household farms. Results: This study, by field testing four organic/inorganic compound fertilizers of biochars pyrolysed via different biowastes compared with conventional chemical fertilizer in a rice paddy, evidenced that biochar compound fertilizer application at a much lower rate of N input ensured rice productivity by improving N use efficiency and reduced GHG emission in rice production. Conclusion: Use of biowaste-converted biochars for organic/inorganic compound fertilizer can be an option to achieve high productivity and low carbon intensity along with saving N nitrogen fertilizer use in Chinese rice agriculture. [ABSTRACT FROM AUTHOR]

Background: We have greater certainty for what has happened in the past than for what will happen in the future. Uncertainty on the impact and value of emissions can be very large. Given all of the elements of uncertainty, we are challenged to set global targets for limiting the environmental impact of emissions, to distribute those targets among the many parties responsible for emissions, to evaluate the trajectories toward targets, to understand the risk involved in not meeting targets, to motivate the collective efforts and burden sharing or trading, and to verify that targets have been achieved. We need a clear and consistent framework for dealing with uncertainty and in this article we use the notion of a risk charge on uncertainty to investigate issues of time in GHG and lifecycle analysis accounting. Results: We address critical issues of short-term storage, time horizons, permanence, trading agreements and model error, and explain the consequences of a risk charge on the associated uncertainties. Conclusions: We demonstrate here how the framework we have built naturally extends to address most types of issues that might arise in placing a value on the uncertainty of GHG emissions, and in quantifying management trade-offs and policy strategies for mitigation and adaptation of climate change. [ABSTRACT FROM AUTHOR]

Tropical hydroelectric dams are now one of the main destinations for funds under the Kyoto Protocol's Clean Development Mechanism (CDM), with 1482 dams approved for credit and 840 dams in the CDM 'pipeline' awaiting approval. Thousands of dams are being built by countries such as China, India and Brazil, irrespective of any additional subsidy based on mitigation of climate change. Carbon credit granted to projects that would occur anyway allows the countries purchasing the credit to emit greenhouse gases that are not offset. Damage to global climate is further increased by CDM accounting procedures that undercount the greenhouse gases emitted by tropical dams. Still more damage stems from the limited mitigation funds being squandered on 'nonadditional' projects such as dams. An example indicating the need to eliminate credit for hydroelectric dams is provided by the Jirau Dam, now nearing completion on the Madeira River near Brazil's border with Bolivia. The dam has severe impacts in addition to climate change. The project was approved (registered) by the CDM Executive Board on 17 May 2013. [ABSTRACT FROM AUTHOR]

Reducing emissions from deforestation and forest degradation plus improving forest-management (REDD+) is a mechanism to facilitate tropical countries' participation in climate change mitigation. In this review we focus on the current state of monitoring systems to support implementing REDD+. The main elements of current monitoring systems – Landsat satellites and traditional forest inventories – will continue to be the backbone of many forest-monitoring systems around the world, but new remote-sensing and analytical approaches are addressing monitoring problems specific to the tropics and implementing REDD+. There is increasing recognition of the utility of combining remote sensing with field data using models that integrate information from many sources, which will continue to evolve as new sensors are deployed and as the availability of field data increases. [ABSTRACT FROM AUTHOR]

Tropical wetland ecosystems, especially mangroves and peatlands, are carbon-rich ecosystems that should be considered to be part of climate change mitigation strategies. Globally, tropical mangroves store 20 PgC and tropical peatlands store 89 PgC. Most of these potentials reside in southeast Asia. Emission factors and activity data are among the most important components to carry out credible assessment. In this article, we explore and discuss emission factors and activity data in light of project development and national reporting using the upcoming IPCC methodologies for wetlands. Country-specific data are needed to reduce uncertainties and hence enhance the projects competitiveness. There are opportunities to improve local livelihoods through mitigation strategies in wetlands. Potential bundling with adaptation measures is also discussed. [ABSTRACT FROM AUTHOR]

By promoting the conservation and restoration of natural ecosystems, policymakers have a unique opportunity to mitigate climate change while providing social and environmental benefits. Here we highlight how nature-based mitigation strategies for multiple benefits can be supported by three key areas of scientific research, drawing upon examples of research by Conservation International and its partners. First, monitoring of ecosystems can quantify the magnitude of emissions released from conversion and degradation, and can inform prioritization and planning efforts. Second, understanding the synergies and tradeoffs between climate change mitigation and other ecosystem benefits can aid in designing policy instruments, selecting management techniques and geographically targeting actions. And third, research on the design of policies, incentives and practices can enhance mitigation initiatives' provision of both climate and noncarbon benefits. Achieving multiple benefits can in turn increase the sustainability of and investment in nature-based mitigation. [ABSTRACT FROM AUTHOR]

“Current efficiency targets are based on a production-based logic leading to outsourcing and higher costs. Allocating emissions to the point of consumption may better reflect the ability to pay the costs of mitigating emissions.” [ABSTRACT FROM PUBLISHER]

Keywords: accounting; additionality; carbon benefits; leakage; livelihoods; permanence EN accounting additionality carbon benefits leakage livelihoods permanence 571 573 3 07/10/20 20131201 NES 131201 The role that REDD+ can play in mitigating climate change is recognized by Parties to the UNFCCC [1]. The scale at which GHG emission reductions and removals from REDD+ should be assessed has been debated in UNFCCC negotiations [3], with most Parties favouring national or subnational approaches over the project-scale accounting that is common in the voluntary carbon market. Accounting, additionality, carbon benefits, leakage, livelihoods, permanence. [Extracted from the article]

Keywords: blue carbon; mangrove forests; national governments; saltmarsh; seagrass; tidal wetlands; tragedy of the commons EN blue carbon mangrove forests national governments saltmarsh seagrass tidal wetlands tragedy of the commons 477 479 3 07/10/20 20131001 NES 131001 The benefits of coastal wetlands to coastal communities have been known for decades. Through the guidance for carbon accounting in coastal wetlands provided in the upcoming IPCC supplement, the responsibilities and benefits of improved coastal wetland management for national governments are clearer. The Wetland Supplement is due to be delivered at the end of 2013, thereby providing guidance to national governments on reporting carbon emissions and sequestration for land-use transitions in coastal wetlands. Overall, successful wetland conservation is a product of the property rights and other institutions that define access to wetland resources [13]. [Extracted from the article]