Plants need carbon dioxide to grow. Humans are emitting the stuff into the atmosphere in excess. Therefore, humans are helping plants. So goes one of the more long-lived arguments put forward by people who deny the reality of man-made climate change — an who attempt to turn the CO2 –> global warming –> bad narrative on its head. The Heartland Institute, most recently, made it the focal point of a campaign asserting that CO2 is actually good for human and environmental health.
Source: salon.com