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So what specifically in your list do you think will cause humans to go extinct?

• codebje 7y ago
  Phytoplankton are also responsible for 50-80% of atmospheric oxygen, so in the parent poster's scenario I think the loss of a breathable atmosphere is the most likely nail in our species' coffin. Probably won't happen, probably not a great idea to push things to see how far we can let things go before it's catastrophic, though.
• Daishiman 7y ago
  I don't need to speculate on this. There is never anything "specific" as any one of these things individually and all things combined are a death sentence. With a 9 degree temperature increase a large amount of the planet simply becomes uninhabitable during the summer, period.