War, since we have not enough "fresh" places... But the worst outcome is not from humans, who can shield themselves a bit (insulated homes + heat pumps + p.v. f

War, since we have not enough "fresh" places... But the worst outcome is not from humans, who can shield themselves a bit (insulated homes + heat pumps + p.v. for instance) but for natural resources, so far we have started loosing many fertile land and no new land arrive in substitute, actually we still need to eat...