The general assumption in the climate change circles has been that there can be no substantial outcome at Copenhagen unless the U.S., India and China -- among the world's largest greenhouse gas emitters -- agree to binding norms. Given the current state of the U.S. economy, that will be a tough sell for President Obama and his negotiators, since India and China are unlikely to give in to mandatory targets or trade barriers; they are pushing for developed countries (accused of being prime polluters) to bear the heavier financial burden of keeping Earth from heating over two degrees Celsius, a debt the U.S. has stoutly denied that it owes developing nations. However, both India and China seem to be aware of how crucial it is for them to develop at a fast clip, but sustainably.