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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.

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.

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.

Climate change is also clearly a matter of huge interest and concern for the scientific community.

It's absolutely not acceptable for people to argue that, if we are going to do anything about climate change at all, well, the responsibility lies solely with the individual.

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.

Some scientists believe climate change is the cause of unprecedented melting of the North Pole, and that effects these very uncertain weather patterns. I think we should listen to those scientists and experts.

Maybe climate change is a threat, and maybe climate change has been tarted up by climatologists trolling for research grant cash. It doesn't matter.