To play Devil's Advocate to DaveMatrix's quoted piece:
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The current atmospheric CO2 level is about 380 ppm and the estimated temperature increase since 1880 (when regular temperature recordkeeping began) is estimated to be about 0.60 degrees Centigrade.
Since at least half of this temperature increase pre-dated 1950 – prior to any significant increase in atmospheric CO2 levels – we can estimate that the 30 percent increase in atmospheric CO2 since the Industrial Revolution is associated with a temperature increase of about 0.30 degrees Centigrade. This supports the idea that doubling atmospheric CO2 from pre-Industrial Revolution levels would cause less than a one degree Centigrade increase – and we’re not close to such a doubling.
Since this small variation in global temperature is well within the historical climate record, panic hardly seems warranted.
So where does all the fuss about manmade CO2 and global warming come from? Not from actual temperature measurements and greenhouse physics – rather it comes from manmade computer models relying on myriad assumptions and guesswork. Many models incorporate hypothesized “positive feedbacks” in the climate system, which tend to amplify model predictions. But no model has been validated against the historical temperature record. So they don’t “radiate” much confidence when it comes to forecasting temperatures.
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Research said to prove that greenhouse gases cause climate change has been condemned as a sham by scientists.
A United Nations report earlier this year said humans are very likely to be to blame for global warming and there is "virtually no doubt" it is linked to man's use of fossil fuels.
But other climate experts say there is little scientific evidence to support the theory.
In fact global warming could be caused by increased solar activity such as a massive eruption.
Their argument will be outlined on Channel 4 this Thursday in a programme called The Great Global Warming Swindle raising major questions about some of the evidence used for global warming.
Ice core samples from Antarctica have been used as proof of how warming over the centuries has been accompanied by raised CO2 levels.
But Professor Ian Clark, an expert in palaeoclimatology from the University of Ottawa, claims that warmer periods of the Earth's history came around 800 years before rises in carbon dioxide levels.
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