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 Science Program scientific information. In March 2005, Rick S. Piltz resigned from CCSP charging political interference with scientific reports: "I believe ...that the administration … has acted to impede forthright communication of the state of climate science and its implications for society." Piltz charged that the Bush Administration had suppressed the previous National Assessment on Climate Change, by systematically deleting references to the report from government scientific documents. Piltz later complained about political tinkering with the timing of SAP 4.6, and suppression of sea level rise mapping studies associated with SAP 4.1. Climate Change Science Program The Climate Change Science Program (CCSP)