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Cold comfort.

Document Cited in Related
Vincent
AuthorGriffiths, Craig
PositionLetters - Letter to the editor

I am not a climate-change sceptic, but it seems to me that, amid the ever-increasing media frenzy surrounding the issue, there has been little discussion about the validity of its underpinning assumptions.

The theory, as we all know by now, is that humans are responsible for climate change. The main evidence that scientists present to support this is that higher levels of carbon dioxide were found in the ice sheets during previous periods when the climate was much warmer. They then correlate the increases in temperature with global warming. But one detail they omit is that any increase in C[O.sub.2] occurred an average of 500 years after any increase in temperature. This was probably caused by an increase in C[O.sub.2] released from the oceans as the planet got warmer.

The main constituent of greenhouse gases is water, accounting for 40,000ppm. C[O.sub.2] accounts for 500ppm, of which about 0.002 per cent comes from man-made sources.

The truth is that the Earth's climate has oscillated between warm and cold periods over millions of years and it will continue to do...

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