As far as I know this is calculated into climate change models. So I'm curious based on what study you assume plants will flourish unlimited to compensate all

As far as I know this is calculated into climate change models. So I'm curious based on what study you assume plants will flourish unlimited to compensate all additional CO2. The IPCC report analysis increase risks with more CO2. Shouldn't the risk go down if plants would just compensate it? And apparently the Amazonas as a whole org is now no longer consuming CO2 and is a net negative.