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
Human Rights and Climate Change violations resulting from the impacts of global warming and climate change caused by acts and omissions of the United States." The petition was rejected, but the Commission invited and heard testimony on the relationship between human rights and climate change from representatives for the Inuit in 2007. That same year, the Malé Declaration on the Human Dimension of Global Climate Change "stated explicitly (and for the first time in an international agreement) that 'climate change has clear and immediate implications for the full enjoyment of human rights' and called on the United Nations human rights system to address the issue