Venus is also a thing. But agreed, (intentional) terraforming will be a good idea at some point. Disagreed on CO2 being the right way to do it; the sun was di

Venus is also a thing. But agreed, (intentional) terraforming will be a good idea at some point. Disagreed on CO2 being the right way to do it; the sun was dimmer 60 million years ago. You can't feel your way into a solution here, you have to do the research and the simulations. You also can't optimize for a genetic milieu that no longer exists. Think of the biosphere as a large and highly redundant CHON pump, where the redundancy is at the population (not individual) level. This pump can function under various climactic conditions but its capacity and robustness depend on the population genetics available on the ground (sea). So the important part of the system is made of information not matter. We literally do not have the information we need to replicate cretaceous conditions, nor do we have a way to get that info at present. Therefore we should continue to cultivate the interglacial genetic repertoire, which is still available to us. Large changes to the system should not be allowed when we do not understand systemic risks and do not have rollback ability-- this implies extreme measures should be pointed at maintaining stability rather than inducing phase change. I don't know what primary production looks like under different climactic regimes so I can't speak potential to end states, but they all occur long after our deaths so our worst case will be bounded by short term inflection where risk beats adaptation and primary production "temporarily" crashes.