Part of Earth’s protective ozone shield may be thinning over the most heavily populated regions of the globe, even as an ozone hole over Antarctica continues to mend, international researchers said Tuesday. The global ozone layer, protected by an international treaty, absorbs hazardous ultraviolet radiation from the sun that can damage DNA and heighten the risk of cancer and other health problems.

Source: Wall Street Journal February 06, 2018 06:00 UTC