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"BEIJING -- Top U.S. officials on Wednesday left open the possibility that China might not have to accept a hard cap on its greenhouse gas emissions under a new global climate change treaty."

"The oil giant Exxon Mobil, whose chief executive once mocked alternative energy by referring to ethanol as “moonshine,” is about to venture into biofuels."

The debate over the giant climate-change and energy bill now before Congress has set off a fight between Eastern and Midwestern politicians over transmission lines and solar and wind energy. Many of the best wind sites are in the Midwest, far from the electric load in populous East Coast cities.

This spring's run-up in oil prices is hard to explain on the basis of market fundamentals. It seems to be the result of speculation in the commodity markets.