Climate scientists generally agree that industrialized countries like the United States must have reduced their greenhouse gas emissions between 20-40% below 1990 levels by the year 2020 if global warming tipping points are to be avoided. Unfortunately, President Obama and other important decision-makers in the US have not indicated they are willing to commit to reductions anything like this ambitious. Going into the Copenhagen climate negotiations this, the United States offered to cut emissions to about 4% below 1990 levels by 2020. That’s not even close to what’s needed, and the US will have to increase its emissions-reduction targets dramatically for the rest of the world to take US climate policy seriously.
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