Earth will become too hot to handle in a billion years. There's a (very) remote chance a passing star could save us by knocking our planet back into the habitable zone.
We’re talking at very least hundreds of millions of years in the future and the alternative being literally moving the Earth. I think we can handwave an algae farm
We’re talking at very least hundreds of millions of years in the future and the alternative being literally moving the Earth. I think we can handwave an algae farm