[maxbond]

I don't think it's really something we have to worry about, the amount of energy we're able to bring to bear is miniscule at that scale. Nothing we do will meaningfully hasten or prolong the heat death of the universe, our entire energetic history pales in comparison to a single supernova.

Maybe someday that won't be true, but not on a timeline we can really plan for. It probably wouldn't even be humans doing it at that point, but some descendant species (or constellation of many).

I'd propose we expend our energies prolonging the life of our ecosystem and take our challenges one century at a time.