Speaking at the UN Framework Convention on Climate Change, the Chinese government called for wealthier, developed nations to cut their greenhouse gas emissions, while not requiring developing nations to do so. In the developing nations, China says national appropriate mitigation efforts should be measured based on sustainable development. Meanwhile, the Chinese government wants nations such as the United States, Britain and Japan to reduce emissions by 85 to 90 percent below 1990 levels by 2050. They also want emission levels to be reduced by 25 to 40 percent by 2020. China further called on developed countries to provide “measurable, reportable and verifiable” technology transfer and financial support to national mitigation efforts in developing nations which are new and additional to official development assistance (ODA). However, China did call on developing nations to prepare national Adaptation Programmed of Action (NAPAs) which would assess vulnerability to climate, assess adaptation costs and measures and prioritize adaptation needs of these developing nations.