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There has been evidence throughout history of cycles when the earth gets warmer and cycles when the earth gets colder. We should always be wise stewards of the earth and all of our natural resources. But as a policymaker, I won't be guided by the global warming propaganda machine. Al Gore - we need you to return your Nobel Peace Prize!

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.

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

I have been one of the guys who have been skeptical of global warming from the beginning. The jury is obviously still out on it. We see nothing but conflicting reports from across the globe. I'm not sure; I'm not a scientist.

You always have to be worried about something that is considered a so-called 'scientific theory' that fits every scenario. Climate change, as they've defined it, can never be disproved.

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.

I believe the earth's climate is changing, but I think it's changing for natural variation reasons and I think mankind has been adapting to climate as long as man has walked the earth.

Any objective look at what science has to say about climate change ought to be sufficient to persuade reasonable people that the climate is changing and that humans are responsible for a substantial part of that - and that these changes are doing harm and will continue to do more harm unless we start to reduce our emissions.