the ozone hole - a perfect example how science, supported by observations from space, has led to changes in human behaviour. The ozone hole is recovering thanks to the 1997 Montreal Protocol that forbids the use of chlorofluorocarbons @ESA_EO @CopernicusEU http://www.esa.int/Our_Activities/Observing_the_Earth/Copernicus/Sentinel-5P/New_kid_on_the_block_picks_up_relay_for_ozone …