Recently, world leaders announced some deeply disturbing news: they gave up on reaching a binding climate deal at the upcoming Copenhagen conference. 
A major impediment was the refusal of President Obama and Congress to enact tough cuts in greenhouse gas emissions.
We've got to turn that around. Immediately.
Right now, the most ambitious target that Obama has endorsed is a 3.5% reduction in emissions by 2020. 
That's pathetic, compared to the 25-40% reduction that we need to have a 50:50 chance of avoiding disastrous runaway global heating, according to the International Panel on Climate Change. 
The United States ought to lead by example. We can do it with strong emission reductions.