Among other things, nuclear war is guaranteed to happen. Climate chaos, overpopulation, and resource scarcity has rendered it a fast approaching inevitability. Even a small amount of nukes could destroy our world entirely. Any nukes that hit nuclear power plants will send their highly radioactive cores flying into the atmosphere. When there, they will immediately start to eradicate O3 molecules. Otherwise known as the ozone layer. Without the ozone layer, our atmosphere can't maintain itself. Without a proper atmosphere, the oceans will boil off into space and the land will be scorched with cosmic radiation. The earth, at this point, will become a mirror of mars (at best). Probably more like the moon or venus. All life, beyond the tiniest bacteria, will be dead. Forever. Beyond divine intervention, or extraterrestrial assistance, there's nothing that can be done to change this outcome. We're all in hospice now.
You know what's funny? That nuclear weapons will be the gun that humanity (and by extension life itself) will use to blow its own brains out. Unintended or not, our destiny as a species was suicide all along. How ironic for the pro-lifers of this world to grapple with.