By now you've surely seen this figure, it was the talk of #climatetwitter today. But the most interesting part is the region I've circled. It's where Earth is constantly sliding in and out of ice ages 📉❄️📈🌲📉❄️📈🌲📉❄️ 
There's a paper you don't hear about very often Ganopolski-2016 that starts with Earth's orbital eccentricity, obliquity, and precession, which affect how much solar radiation the Northern hemisphere receives. Then it calculates...
...how much CO₂ is needed to boost the greenhouse effect enough to have prevented those ice ages. Turns out, ~425 ppm is pretty good estimate for "ice-age proofing" Earth.
@eaglehibma Paper’s Reference 1 is “Milanković, M. M. Canon of Insolation and the Ice-Age Problem (Koniglich Serbische Academie, 1941)”
aka: Milankovitch Cycles.
Not seeing why you claim disagreement or disinfo?
aka: Milankovitch Cycles.
Not seeing why you claim disagreement or disinfo?
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