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We can look back through ice-core data and see over 800,000 years, relationships between carbon dioxide and the temperature of the world. So those people who deny the importance of climate change are just wasting their time. They're also being diversionary because if we don't act the risks are enormous.

Scientists have been warning about global warming for decades. It's too late to stop it now, but we can lessen its severity and impacts.

If you really accept that global warming puts the world at risk, then you think you would be open to any solution that could undo it.

There's some politicians who still seriously believe that we haven't got global warming.

It is baffling, I must say, that in our modern world we have such blind trust in science and technology that we all accept what science tells us about everything - until, that is, it comes to climate science.

A majority of American citizens are now becoming skeptical of the claim that our carbon footprints, resulting from our use of fossil fuels, are going to lead to climatic calamities. But governments are not yet listening to the citizens.

Many of the alarmists on global warming, they've got a problem because the science doesn't back them up.

I don't like the term 'global warming,' because it's misleading. It implies something that's mainly about temperature, that's gradual, and that's uniform across the planet. And in fact, temperature is only one of the things that's changing.

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.