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Another Cambrian explosion cannot happen due to the lack of energy available energy, and without the necessary technology (whether biological or synthetic) it cannot happen.
As the first poster noted, the Cambrian explosion happened after the Great Oxidation event, where new Oxygen was constantly produced due to micro-organisms conveniently undergoing photosynthesis; something which cannot be fully replicated synthetically even today.
Either way, the human species will probably be all dead, extinct, by 2200 due to the lowering oxygen levels. The carbon, methane, ect. does not matter superficially, but it will kill most of our oxygen suppliers, which would destroy the rest of the ecosystem in a omnicidal chain of dominos.
Hopefully, the technology to grow lab meat and other such innovations come sooner and cheaper, otherwise we’re doomed if Jesus doesn’t come save us or something.
