James V. Hansen: “We have a global emergency.”

I think everyone hopes that increased energy efficiency--and that would be encouraged by a higher price on carbon emissions, and renewable energies--could do the job.

There is a real danger that we will hand young people a climate system that is out of control.

The Obama administration is being forced into a political compromise. It has sacrificed a strong position on mountaintop removal in order to ensure the support of coal-state legislators for a climate bill.

With regard to China and India and the likelihood that they would cooperate, it should be pointed out they will suffer more from climate change than we will.