Airborne chemicals that destroy ozone are now declining for the first time, helping to repair the atmospheric layer that protects humans from the sun’s harmful ultraviolet rays, according to a new report by a U.N.-backed panel of scientists.
“In a report released Monday by the United Nations Environment Program and the World Meteorological Organization, researchers found a significant thickening of the ozone layer, a region of the atmosphere from 9 to 18 miles high that absorbs ultraviolet rays and prevents them from reaching the Earth’s surface.”