[CalRobert]

I may be wrong, but my understanding is that we currently rely on an abundance of cheap food, cheap transportation, and easy access to clean water in order to keep a higher percentage of the human species than ever before living comfortably. When these things become scarce (as former croplands fail and supplies of fresh water harder to find) the mass migration which results seems likely to create millions if not billions of refugees. This would be a major disruption to civilization in my view. Somewhat unjustly it seems many people in equatorial regions will bear the brunt of the impact of climate change - these are generally people who have contributed less to its root causes.

The reference to antibiotic resistance was dark humour of a sort, but clearly poorly executed. I was simply noting that if all the people are dead then we will emit far less CO2.