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Re:We Just Breached the 410 PPM Threshold for CO2 by clumsysmurf on Saturday April 22, 2017 @04:34PM (#14174604)
CO2 impacts more than plants. For example "Rising CO2 levels reduce protein in crucial pollen source for bees"

https://www.purdue.edu/newsroom/releases/2016/Q2/rising-co2-...

Re:We Just Breached the 410 PPM Threshold for CO2 by ZenoArrow on Saturday April 22, 2017 @05:12PM (#14174839)
There's also ocean acidification.

http://ocean.si.edu/ocean-acidification