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Originally Posted by Hemi-Cuda
and for the past 100 years humans have been pumping carbon that was previously trapped below the Earth's crust into the atmosphere at an astounding rate
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And we can verify the source of the carbon in the atmosphere by measuring Carbon isotope ratios in the atmosphere.
The physics of CO2 acting as a greenhouse gas isn't (or shouldn't I guess I mean, some deny even that) up for debate. Anyone who doesn't think CO2 is a greenhouse gas can buy a bridge that I have for sale on Venus.
Quote:
Originally Posted by Hemi-Cuda
and while we may be in the middle of a natural warming cycle, human activity has helped to speed it up quite a bit
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We're in an inter-glacial warm period which has gone longer than the average (though not nearly as long as the last inter-glacial that had similar properties to this one like orbit and axial tilt, this one's been 12,000 years that one was 30,000 years), and things like solar input and volcanic activity since 1950 should lead to a cooling trend rather than a warming one.