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The biologists have essentially been pushed aside. Al Gore's just an opportunist. The person who is really responsible for this overestimate of global warming is Jim Hansen. He consistently exaggerates all the dangers.

Romney has become reluctant to say that human activity causes global warming, and even in his greener days he was always somewhat cagey about which remedies he'd support.

This Bush administration has a growing credibility gap, maybe even a credibility chasm, on environmental policy. The President has lost the trust of the American people when it comes to the environment.

I think Bloomberg's broad vision of the environment in New York City is something I agree with. I broadly stand with his vision for how to deal with climate change and prepare for future weather events.

Global warming is controversial, of course, but the controversy is mainly over whether human activity is driving it.

I would say that, basically, global warming is a non-problem.

Politicians usually get the blame for dragging their feet on environmental issues. And fair enough. Most of them do just that. But the blame isn't theirs alone. For politicians afraid of losing votes, a bristling media waiting to transform good green ideas into monsters is a colossal disincentive.

I have long understood that climate change is not only an environmental issue - it is a humanitarian, economic, health, and justice issue as well.

I absolutely do not believe in the science of man-caused climate change.

There isn't a more important issue in the world than global warming. Even the Cold War and the Bay of Pigs crisis were a notional threat.