climatologists have always regarded carbon dioxide (co₂) as dangerous since it is supposed to be one of the principle causes of global warming. But then co₂ also performs the valuable function of enhancing floral growth.

Rise in atmospheric co₂ concentration and possible concomitant climate change has been seen to affect ecosystems and agricultural production. Water vapour and greenhouse gases like co₂ affect the heat balance of the earth by absorbing long-wave radiations. Thus, surface temperature would have been much higher in the absence of greenhouse gases. This is referred to as the