TOPSHOT - People swim in the lighted water of the Hirschengraben indoor swimming pool in Bern during an artistic performance by Swiss visual artist Pipilotti Rist and World Wide Fund for Nature (WWF) Switzerland non-governmental organization to denounce the disappearance of corals due to the warming and the acidification of the ocean on October 7, 2018. (Photo by Fabrice COFFRINI / AFP)