The prognosis for international progress on climate change is poor, but in the United States one program, Corporate Average Fuel Economy for motor vehicles, is an emerging success story of multiple agencies and companies agreeing on a template to reduce emissions Carbon dioxide emissions from fossil fuel use are responsible for more than half the greenhouse gases released to the environment worldwide. That's after two decades of international negotiations to limit GHGs, during which CO2 emissions have increased by about one-third. The story is the same for many other greenhouse gases. United States leadership on this issue has been nil, and with many members of Congress (and all but one of the Republican presidential candidates) denying the existence of climate change, not much is likely to happen anytime soon.
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