Professor Peter Cox, a climate expert at the UK's University of Exeter, has studied the Little Ice Age, 400 years ago (Geographical Research letters Vol 33; New Scientist 22 March 2008). (Rising temperatures bring their own CO2 / Grains of Sand)
Cox has noted that:
When it gets colder, the oceans, and eventually the land, absorb more CO2.
So CO2 levels went down after the Little Ice Age began.
Cox notes that when temperatures rise, due to increased solar radiation, there is eventually a rise in CO2 levels.
The temperature rise comes first, and is followed by the rise in CO2.
Cox believes that what we have now, in the present time, is both a rise in CO2 levels due to increased solar radiation and an increase due to human-made emissions.
According to Cox (Rising temperatures bring their own CO2):
"This extra increase will boost global warming in the coming century to about 50 per cent above mainstream climate projections, says Cox, because they only include the effect of CO2 on temperature, and not temperature's effect on CO2.
"The system turns out to be more sensitive than we thought. If we get 4 °C of warming in the coming century, that by itself will raise CO2 levels by an extra 160 ppm."
Pre-industrial levels of CO 2 were 270 ppm
Current levels of CO2 are 380 ppm
Many scientists believe there will be a devastating global climate at 450 ppm.
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