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False-color image of ozone concentrations above Antarctica on Oct. 2, 2015. NASA/Goddard Space Flight Center

Is Earth’s ozone layer still at risk? 5 questions answered

Earth's ozone layer shields us from harmful ultraviolet radiation. Nations have been working to reduce ozone-depleting chemicals since the 1980s, but recent studies show that there is still work to do.
A wide range of industrial processes have released greenhouse gases into the atmosphere. Paulo Resende/Shutterstock.com

Global stocktake shows the 43 greenhouse gases driving global warming

While the gases most responsible for global warming - carbon dioxide, methane and nitrous oxide - continue to climb, other industrial greenhouse gases are being brought gradually under control.

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