Search

随着绿色低碳转型成为全球共识和我国全面建设社会主义现代化国家的内在要求, 未来关键金属消费 将长期大幅增长, 循环利用潜力也将逐渐增大。面对百年变局、新冠肺炎疫情和地缘冲突交织, 加大循环利 用对关键金属供应安全的保障作用已成为美国、欧盟等西方发达国家和地区在国家安全层面的战略共识。文 章通过梳理关键金属循环利用的潜力、挑战和主要发达国家的应对战略, 力图为我国关键金属循环利用战略 和对策制定提供借鉴, 助力实现"双碳"目标和绿色低碳转型。. As green and low-carbon transition has gained world-wide recognition and become the inherent requirement of fully building a modern socialist China, the consumption of critical metals will increase drastically in the next decades. Meanwhile, this will mean a continually increasing potential of critical metals recycling. Facing changes and pandemic unseen in a century and increasing geopolitical conflicts, it has become a strategic consensus on the national security level for Western countries like the United States and Europe Union to acknowledge and enhance the role of recycling in secure provision of critical metals. Here, in this study, we have discussed the future potentials and major challenges of critical metals recycling and reviewed the strategies proposed by the main industrialized countries. Based on this, we aim to help formulate China's national strategies and countermeasures regarding critical metals recycling and thus contribute to supporting the achievement of China's "dual carbon" ambition and its green and low-carbon transition in the next decades. [ABSTRACT FROM AUTHOR]

Copyright of China Population Resources & Environment is the property of Shandong Normal University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Food is one of the basic human needs. Achieving food security is one of the important goals of“The 2030 Agenda for Sustainable Development”. However, there is lack of system review of mutual influence between safeguarding food security and global climate change. Accordingly, this paper reports a critical review of the existing researches related to interactions between ensuring food security and global climate change. Effects of global climate change on the food system, impacts of ensuring food security on global climate change and adapting food security strategies against global climate change were systematically reviewed. The results indicated that, firstly, global climate change had increased uncertainty in the food system which had great impact on China’s food production. Secondly, demand for food was one of the main drivers of global climate change, and the reconfiguration of crop production elements exacerbated global climate change. Thirdly, a synthetic approach is required for food security adaption strategies against global climate change, specifically, in the micro- level promoting technological progress and scientific management, in the meso- level strengthening resources and environment protection, and in the macro- level adhering to the laws of market and improving food policy system. Moreover, under the background of global climate change, research on ensuring food security presents two major trends: one is the change from single discipline, one dimension and single means into multi- disciplinary, multi- scale, multi- factor, comprehensive and integrated approach; the other is to turn a high- carbon food system into a low-carbon and high-efficient food system. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Natural Resources / Ziran Ziyuan Xuebao is the property of Journal of Natural Resources and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Calibrin-Z is a new type of safe and pollution-free adsorbent which was developed by an organization of United States. Chicken were inoculated with clostridium welchii through mouth, the different concentrations of Calibrin-Z was added in their feedstuff, and the intestinal morphology, pathological changes at their different ages were detected to explore the control effect of this reagent on the necrotic enteritis, immune organ index and the immunity levels. The results showed that Calibrin-Z could improve the immune response, decrease the damage to the intestinal mucosa and obviously inhibit the effect of necrotizing enteritis occurrence. The anti-disease mechanism of Calibrin- Z might be associated with the adsorption of clostridium welchii toxin. It would provide an effective method to control the chicken necrotizing enteritis without using antibiotic drugs, which had very importantly practical significance. [ABSTRACT FROM AUTHOR]