【正确答案】正确答案： The science is clear. Arctic sea ice is disappearing faster than expected. The coming United Nations Framework Convention on Climate Change (UNFCCC) in Copenhagen offers a chance to mobilize international collective action to meet his global challenge. Under the leadership of Present Obama and Secretary Clinton, the United States is working with our partners around the world to find common ground and stem the tide of future irreversible damages. We recognize that China must be a leader in the global effort to combat climate change. We have a responsibility as the world's largest historic emitter of greenhouse gases. We know that without US emission reductions, no solution to climate change is possible. And we are confident that the United States can and will take the lead in building the 21st century clean energy economy. But action by the United States and other developed nations is not enough. More than 80 percent of the future growth in emissions will be from developing nations.