Climate change in Japan and Toyota hybrid electric vehicles were named to have the highest fuel efficiency and lowest emissions. The fuel economy and emissions decrease is due to the advanced technology in hybrid systems, biofuels, use of lighter weight material and better engineering. As a signatory of the Kyoto Protocol, and host of the 1997 conference which created it, Japan is under treaty obligations to reduce its carbon dioxide emissions and to take other steps related to curbing climate change. The Cool Biz campaign introduced under former Prime Minister Junichiro Koizumi was targeted at reducing energy use through the reduction of air conditioning
Climate change in the United States climate change initiatives, such as the Regional Greenhouse Gas Initiative in the northeastern United States, the Western Governors' Association (WGA) Clean and Diversified Energy Initiative, and the Southwest Climate Change Initiative. Inside the ten northeastern states implementing the Regional Greenhouse Gas Initiative, carbon dioxide emissions per capita decreased by about 25% from 2000 and 2010, as the state economies continued to grow while enacting various energy efficiency programs. New Policy In January 2017, President Donald Trump announced that to quit Paris Agreement on climate change and United States become the only country that drop out of this agreement. At the