With the development of economy, the issues of energy and environment have aroused wide concern. Internationally, focusing on climate change and exploring a low-carbon development road have become worldwide tendency. Domestically, in Denmark Copenhagen summit in December 2009, China promised to reduce carbon emissions by 40%~50% before 2020, setting a harder target than those developed countries in Europe and America. As for Chongqing, to achieve the development goal of reducing carbon emissions by 40% ~ 50...