evidence: What’s more, a recent UKRI-funded study by an international team of scientists found that if CFCs had not been banned in the late 1980s, their continued use would have caused average global air temperatures to rise by an additional 2.5 C by the end of the century. This is on top of existing warming. The reasons for this are twofold. CFCs are potent greenhouse gases in their own right, and so would contribute directly to climate change. UV radiation also harms plants, stopping them from growing and locking up carbon dioxide from the atmosphere. [...] The other thing concerns what is happening to temperatures in the stratosphere. Although greenhouse gases cause global warming overall, they actually cool the upper atmosphere. Those conditions exacerbate ozone loss.