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We have little choice but to place a certain level of trust in scientists - even when it comes to the model-driven speculative discipline of climate change. And, need it be said, most scientists take great care in being honest, principled and precise.

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.

The idea that human beings have taken a few steps closer toward asserting control over the Earth's climate is likely to strike you as a really bad idea.

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.

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.

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.'

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.

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.