1.IntroductionrnClimate change is currently the most significant untraditional challenge to human development.Most countries have reached an agreement to reduce their carbon emissions to address this challenge[1,2].As the world\'s second largest economy,largest energy consumer,and largest carbon dioxide emitter,China plays an important and constructive role in global climate governance[3].Thus far,carbon dioxide emissions(referred to herein as“carbon emissions”)have peaked in over 50 countries,including the United States,whose carbon emissions peaked in 2007,and Japan,whose carbon emissions peaked in 2013.Carbon emissions in the European Union(EU),as a whole region,peaked in around 1990;however,the carbon emissions of the EU member states peaked at different times.In addition,over 130 countries and regions have proposed goals for net-zero carbon emissions or carbon neutrality.Some developed countries and regions,such as the United States,EU,and Japan,have announced the goal of reaching carbon neutrality by 2050.Furthermore,six countries including the United Kingdom and Sweden have taken more aggressive steps to move the goal of carbon neutrality into a substantive legislative stage[4].