> Earth will not host complex plants in 600 million years. So that’s also a problem - https://en.m.wikipedia.org/wiki/Timeline_of_the_far_future https://en.m.w

> Earth will not host complex plants in 600 million years. So that’s also a problem - https://en.m.wikipedia.org/wiki/Timeline_of_the_far_future https://en.m.wikipedia.org/wiki/Timeline_of_the_far_future If I'm reading that right, that's only C3 plants. C4 plants would keep going until 800–900 million years. And who knows if something else doesn't evolve or is engineered for the different conditions.