Climate Gate

The issue of how curbing emissions would affect jobs in developed countries is likely to erupt in Copenhagen in the battle over how much rich countries should pony up for cleaner technologies in developing nations.

Estimates of the cost for reducing emissions in developing countries vary widely, but the European Commission said in September that the bill could reach $150 billion annually by 2020.

The oil industry has warned that climate legislation could force some U.S. refineries to shut down, because importing gasoline from countries without emission caps could be cheaper than making the gasoline on domestic soil.