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We're below 2 ppm methane. One source I read said it accounts for about 15% of warming due to greenhouse gases.
It's not nothing, but doesn't seem to be anywhere near the change we're seeing with CO2.
I've always wondered what the biologic impact of increasing CO2 concentrations would be. Our breathing reflex is triggered not by lack of oxygen, but from buildup of CO2 concentrations. Doubling that concentration must have some effect, even if small.
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