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
International Conference on Climate Change physicist S. Fred Singer. The conference endorsed the work of the "Nongovernmental International Panel on Climate Change" (NIPCC), which is a group of skeptics led by Fred Singer that disputes the positions of the United Nations Intergovernmental Panel on Climate Change (IPCC). Singer prepared a critique of the IPCC Fourth Assessment Report called "Nature, Not Human Activity, Rules the Climate". This NIPCC report was published in March 2008 by the Heartland Institute. ABC News said the same month that unnamed climate scientists from NASA, Stanford, and Princeton who spoke to ABC about the report dismissed it as "fabricated nonsense." In