This will lead to a strange world, one that’s both hot and without much CO2. As a result, there won’t be much plant life anywhere, or animal life for that matter, since both depend on the stuff. Already, as carbon dioxide has dropped since dinosaur times, plants have evolved new photosynthetic pathways to adapt to this new low-CO2 regime. These are the so-called C4 plants, plants like grasses and shrubs and cacti. Over the next few hundred million years, these plants will slowly come to dominate this hot, humid, and generally unpleasant world, while many trees and forests, unable to
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