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And we all know that CO2 levels increase after temperatures warm up , not the other way around.

Climate myths: Ice cores show CO2 increases lag behind temperature rises, disproving the link to global warming

Catherine Brahic, NewScientist.com news service
16 May 2007

The ice ages show that temperature can determine CO2 as well as CO2 driving temperature. Some sceptics – not scientists – have seized upon this idea and are claiming that the relation is one way, that temperature determines CO2 levels but CO2 levels do not affect temperature.

To repeat, the evidence that CO2 is a greenhouse gas depends mainly on physics, not on the correlation with past temperature, which tells us nothing about cause and effect. And while the rises in CO2 a few hundred years after the start of interglacials can only be explained by rising temperatures, the full extent of the temperature increases over the following 4000 years can only be explained by the rise in CO2 levels.

What is more, further back in past there are examples of warmings triggered by rises in greenhouse gases, such as the Palaeo-Eocene Thermal Maximum 55 millions years ago.

Finally, if higher temperatures lead to more CO2 and more CO2 leads to higher temperatures, why doesn't this positive feedback lead to a runaway greenhouse effect? There are various limiting factors that kick in, the most important being that infrared radiation emitted by Earth increases exponentially with temperature, so as long as some infrared can escape from the atmosphere, at some point heat loss catches up with heat retention.

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