My pet theory is that we are only a few decades away from turning earth into venus 2.0 at this point. It feels like we keep finding new catastrophic tipping points every few months at this point.
It is worth mentioning that we are already in the last few hundred million years of earth's lifespan -- the sun was much dimmer last time the planet had this much GHG and warming going on. We may have already set the conditions for the oceans to boil away and the heat death of our planet without massive geoengineering.
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