Young activists install giant "carbon clock" at former gasometer in Berlin
A giant "carbon clock", installed by young activists from the "Fridays for Future" campaign, displays how much carbon dioxide can be released into the atmosphere to limit global warming to a maximum of 1.5 or 2 degrees Celsius, at former gasometer, ahead a worldwide climate strike over the weekend, in Berlin, Germany September 18, 2019. REUTERS/Hannibal Hanschke