((Sorry for the wait! I went on mini-hiatus for a bit. Feel free to ignore if you'd rather drop the thread!))

Don't even pretend you don't think they were the work of humans. Planets don't create 'seas of death' because they wake up one day and feel contrary. Your world already went past the point of no return; whatever force was responsible for maintaining the life of your planet is dead or halfway there.

Humans are humans. Even if you revive the world, in a thousand years, your descendents will have forgotten your efforts, and the world will be plunged into disaster again.

You're too short-sighted to make it last.