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Explore the diversity of carbon reduction instruments is significance for fulfill of scientific outlook on development, and practice of Kyoto Protocol and Copenhagen Treaty, as well as the realization of economic and environmental sustainability. Representative of the environmental audit of information technology tools for the implementation of cost and time efficiency advantages, is considered for the next generation of management tools, information-based instrument and the traditional command-and-control instrument, market-based instrument constitute the current environmental regulation of the three main approach, the paper analyzes the research status and perspectives of carbon reduction regulation instruments, particularly demonstrates the motivation, contents, methods and application of environmental auditing, on this basis, put forward several recommendations for China's environmental auditing future development in order to its better play in energy conservation and emission reduction.

Fostering co-modality and consequently reducing carbon emissions is a leading objective of the Scottish and UK governments and the wider EU and worldwide community. The achievement of such goals can be facilitated by the adoption of ICT measures within the transport systems. Over recent years, many online and mobile applications have emerged which improve the usability and attractiveness of more sustainable transport modes (such as public transport, taxis, and cycling) and can help to utilise private cars more effectively by promoting and enabling car-sharing and car-pooling. The recently completed FP7 funded EU project COMPASS has investigated the impact of a range of Information and Communication Technology (ICT) tools which have the potential to improve co-modality. This paper discusses the results of Scotland specific modelling which demonstrates and quantifies the relative carbon/congestion reductions feasible from ICT measures to improve bus journey times and ICT measures to improve car-sharing. It may be seen that measures which act to decrease overall car usage have more impact on reduction of carbon emissions than measures to improve public transport travel-times.