In rare good news for the planet, Earth's ozone layer is on track to recover completely within decades, as ozone-depleting chemicals are phased out across the world, according to a new United Nations-backed assessment. The ozone layer protects the planet from harmful ultraviolet rays. But since the late 1980s, scientists have sounded the alarm about a hole in this shield, caused by ozone-depleting substances including chlorofluorocarbons, dubbed CFCs, often found in refrigerators, aerosols and solvents. Link in bio to read more. 📷: NASA