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% increas

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.