That contradicts Fair Game's original statement: "More CO2 will mean plants do less well." CO2 is a fertilizer, sure if you fertilize but forget to water, your plants will die. That doesn't mean CO2 harms plants.Read but not understood.
"As nitrogen limitation to productivity is widespread, persistent nitrogen constraints on terrestrial responses to rising CO2 are probably pervasive." There's not enough Nitrogen for CO2 to fertilize.
CO2 is essential to life; emitting CO2 into the air might be the most productive thing Fair Game has ever done. It certainly beats hairbrained claims like: "More CO2 will mean plants do less well."