War contributes greatly to global warming which shouldn't surprise us. All those bombs going off all those rockets all those planes and helicopters. All that fuel of various kinds being used. It pollutes the air and water of this very fragile and interconnected planet.
There are historic situations in which refusal to defend the inheritance of a civilization however imperfect against tyranny and aggression may result in consequences even worse than war.
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All this happened more or less. The war parts anyway are pretty much true.