DIE ZEIT: Professor Stevens, the world climate report describes clouds as the greatest uncertainty factor for climate forecasts. Why is that?
Bjorn Stevens: See that cloud out there? In my field, most people think of a cloud as these compact white objects in the blue sky...
ZEIT: Just like in the children's book… How much water does this cloud contain?
Stevens: A cloud the size of an old building can only hold a liter of water.
ZEIT: That would fit in a pint of beer!
DO NOT TRY THIS AT HOME !
Compressing water to a density of 2.2 in a beer stein poses a serious maß extinction risk.
