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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!

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.

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.

The science tells us that if we fail to reduce global warming pollution, global temperatures will rise to dangerous levels and unleash devastating extreme weather events and accelerate destructive sea level rise.

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.

I would be absolutely astounded if population growth and industrialisation and all the stuff we are pumping into the atmosphere hadn't changed the climatic balance. Of course it has. There is no valid argument for denial.

I believe global warming and climate change are real threats to our planet.

In the history of the world, all five mass extinctions have been accompanied by massive climate change, so we are facing an incredibly serious threat. In fact, we are technically in the sixth mass extinction right now, and it is the first mass extinction being attributed to humans.

Unfortunately the global warming hysteria, as I see it, is driven by politics more than by science.

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.