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As far as I understand it, lot of CO2 is trapped in the polar ice caps, and as global heating melts them, it releases more CO2.
However, this does not mean that CO2 does not worsen global warming, rather, it might just mean that even a little bit of global warming could cause a runaway chain reaction as the ice caps begin to melt while we are deforesting, lessening the planet's ability to re-absorb CO2, rather than planting more forest to bind the CO2 again.
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