re: AGW Deniers - Seems Kind of Hopeless

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I'd say at the temperature that prompted hundreds of millions of people to settle along the Earth's sea coasts.

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What if the earth without human intervention becomes hotter or colder over the next few centuries? Should we attempt to engineer a stable temperature range fighting the power of the sun or just accept that these changes will occur and most infrastructure needs to be replaced on a century scale that allows us to adapt over time?