Researchers quickly traced the cause to human-made ozone-depleting substances (ODS), particularly chlorofluorocarbons (CFCs), ...

When CFCs drift up into the stratosphere, they can break down ozone under certain seasonal conditions. The following year, ...

From 2002 and 2012, according to Nature, CFC-11 emissions fell by about 0.85% a year. But from 2013 that figure was cut almost in half, to about 0.4% — the result of about 13,000 metric tons a ...