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
Women in climate change made significant contributions to major scientific assessments such as those of the Intergovernmental Panel on Climate Change and the Millennium Ecosystem Assessment and are reasonably well represented on key global change committees of the International Council for Science (ICSU) and US National Academy of Sciences. Women have played important leadership roles in international climate policy. For example, Christiana Figueres leads the international climate negotiations as the Executive Secretary of the UN Framework Convention on Climate Change (UNFCCC) and former Irish President Mary Robinson is the UN Special Envoy on Climate Change. Susan Solomon chaired the climate science working group 1