Climate aside, doesn't the increase of CO2 from 280PPM to 400PPM not have a substantial impact on the respiration of trees and animals? 42% increase of poison to animals has no meaningful impact?
I'm not sure about other animals, but 400ppm is a long way away from toxic for humanity. Poorly ventilated indoor environments can easily hit 1200-1500ppm. You've got to hit 70,000 to 100,000 ppm before you start running the risk of coma and death.
Interestingly some studies indicate that 1200ppm and higher might confer some mild cognitive impairment, even if it's a long way away from fatal. This has been used glibly to explain the poor decisions made in office rooms, but one does wonder what happens to humanity if global emissions make us slightly dumber.
At 400 ppm CO2 is only 0.04% of the total atmosphere. Increasing from 0.028% to 0.04% is a 42% increase, but 0.04% is too low to directly poison plants.
The climate change effects will be a problem long before plants and animals start getting poisoned by it.
It doesn't poison plants, they rely on CO2 in much the same way that animals rely on O2. I know that it's a negligible part of the atmosphere, but a 42% increase on the primary mechanism for plant respiration, which is also a poison for animals, seems like it would have a meaningful impact.
