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It should simply be an empirical matter whether the climate is changing or not and whether we're responsible. But the various sides of the debate have now become so tribal that it's no longer a matter of changing our views as more information comes in.

There is no question that climate change is happening; the only arguable point is what part humans are playing in it.

When we think about global warming at all, the arguments tend to be ideological, theological and economic.

As this body of knowledge has evolved, a much more critical job for researchers and scientists has evolved into explaining and educating policy makers and the public to the risks of global warming and the possible consequences of action or of no action.

If you look at all the serious scientists in the world, there is no big disagreement on the basics of this... it would be absolute lunacy to act as if climate change is not occurring.

Ah, to be a conservative climate change denier. While real scientists must do all the research and engage in heated debates about just how bad things are going to be, the deniers can rest easy in the bliss of willful ignorance.

The conversation on global warming has been stalled because a shrinking group of denialists fly into a rage when it's mentioned.

I have not made any suggestions about climate change. This is more about blending or shifting the conversation about the environment versus the economy. It's just such an old, outdated conversation.

The whole climate change debate gives - and there are all kinds of quotes from adherents of and promoters of climate change - the reason they're doing it is it's such a great opportunity to control, you know, pretty much, government, and control your lives.

The pace of global warming is accelerating and the scale of the impact is devastating. The time for action is limited - we are approaching a tipping point beyond which the opportunity to reverse the damage of CO2 emissions will disappear.