I don't think inaction causing extinction is certain. All extinction scenarios involve unproven positive feedback loops like the clathrate gun hypothesis. It se

I don't think inaction causing extinction is certain. All extinction scenarios involve unproven positive feedback loops like the clathrate gun hypothesis. It seems to me quite likely that billions of humans will survive in the remaining habitable regions, even if the fight for those regions turns into World War 3. Really it's not much worse than the Cold War-era nuclear war scenarios.