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
Tropical cyclones and climate change noted that it is not yet clear to what extent global warming caused the increased water temperatures, but observations are consistent with what the IPCC projects for warming of sea surface temperatures. In July 2018 Japan experienced a natural disaster: heavy floods and landslides, who killed more than 200 people, make 2 million to flee. This was the consequence of unprecedented heavy rain and the typhoon Prapiroon. Scientist suggests, that climate change is probably one of the main cause for the disaster. This is in line with government predictions for the impact of climate change on Japan. A 2012 report