chief forester jÖrg dunger is on his way to the luchsee.eads him to a spot where just a few years ago, they would have got their feet wet. >> this bog is a living body. one that's shrinking. >> standing here my boots are getting wet. but it's actually two metres below the water level that the lake used to have. >> in my case, my head would be underwater. that shows you the extent of the situation. >> when major carbon sinks like fenlands dry out, they release their carbon into the atmosphere. that drives climate change, putting more pressure on the lakes. but the foresters spot another problem -- the huge structure nearby, which surely requires a lot of water. mewhile, at berlin's mÜggelsee lake, there's more evidence of the growing water shortage and the impact that it's having: >> very early in the year, the threat level for forest fires was high. which again shows we don't have enough water. >> scientists have been tracking the growing water shortage here for decades. >> if you look at this graph, which covers a period of 50 years, you c