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Climate change - for so long an abstract concern for an academic few - is no longer so abstract. Even the Bush administration's Climate Change Science Programme reports 'clear evidence of human influences on the climate system.'

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.

Once you start to look into the guts of climate change you find that just about every scientific institution in the world is conducting research on the issue.

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.

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

Climate change is a terrible problem, and it absolutely needs to be solved. It deserves to be a huge priority.

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 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 think any thinking person should be worried about climate change.

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.