evidence: "We know the ozone layer is connected to climate. We know greenhouse gases affect the ozone layer. But what we’ve never done before this is connect the ozone layer to the terrestrial carbon cycle," said lead author Paul Young, an atmospheric and climate scientist at Lancaster University in the United Kingdom. The ozone layer in the upper atmosphere, or stratosphere, blocks UV radiation that can damage living tissue, including plants. The ozone "hole," discovered in 1985, is the result of humans emitting chlorofluorocarbons (CFCs), which are ozone-depleting chemicals and greenhouse gases that were once commonly used as coolants in refrigerators and in aerosols like hairspray. They were then phased out of use by the Montreal Protocol signed in 1987 and its subsequent amendments. [...] That huge increase in atmospheric CO2 alone would cause global temperatures to rise 0.85°C (1.53 °F) by 2100, according to the models. That’s on top of the warming Earth may experience due to prior and expected emissions of CO2 and other greenhouse gases, as well as the 1.7°C (3.06 °F) of direct warming due to increased CFC emissions in this scenario.