A science fiction writer's blog.
Indeed they are -- though the transition from Pleistocene conditions will not necessarily be pleasant. I seriously doubt that anything likely to happen even if we have the maximum plausible anthropogenic warming will doom the human race. However, they could cause some bad effects for existing civilizations as climate zones shift: historically, climate change always has before.
Watch the video: 70 years before any shift from the positive effects we're experiencing to any possibility of negative effects. But that's just a small part of this video.
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