here, ecohydrologist doctor jÖrg lewandowski does his research. >> at first when you see this much water. but at the same time, berlin is really water-poor. because there is very little precipitation. we're in a region of germany with the least amount of precipitation, and as a result, berlin will have big problems with quantities in the long term. that's because climate change is magnifying the problem. it's likely that less groundwater recharge is taking place because water is not seeping in. it's already evaporated beforehand. >> this is already having visible consequences for forests and bogs. chief forester jÖrg dunger is on his way to the luchsee. district forester peter paulik leads 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 th