The tendency of those committed to the theory of catastrophic man-made global warming to unquestioningly adopt the assumptions, at every stage, that maximise the expectation of calamity should alert us that groupthink is driving the movement.

Given that we are passing the climate change bill, which is based on the supposition that the climate is getting warmer, let me point out that it is now snowing outside, in October.

The simple fact is that, since the beginning of this century, the average global temperature has flatlined; indeed, over the past 18 months it has fallen back, and according to the satellite measurements of temperature, it is now basically back at the level it was in 1979, when such measurements started to be taken.

I am a global lukewarmist.

For a theory to be scientific it must be capable of being refuted by the evidence. Given that we have had three decades of rising temperature followed by a decade of stable and slightly falling temperatures worldwide, how many decades would you require before you are convinced that the theory on which you are committing £400bn of taxpayers' money might be slightly wrong?

The tendency of those committed to the theory of catastrophic man-made global warming to unquestioningly adopt the assumptions, at every stage, that maximise the expectation of calamity should alert us that groupthink is driving the movement.

Scientists would rather change facts than their theories.