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Not much? A few degrees warmer here or there, and a few feet increase in sea level? And that's in ~100 years.

Mass famine, economic collapse, war, and ultimately the collapse of industrial civilization: http://nymag.com/intelligencer/2017/07/climate-change-earth-...

This isn't scientific, it's speculation. People have speculated the world will end "soon" for millennia. Is there anything new to add?

It is based on decades of fantastic scientific research into climate change and its impacts. The newer annotated version of this article provides citations: http://nymag.com/intelligencer/2017/07/climate-change-earth-...