risen by two degrees celsius since records began more than twice the global average scientists say it could rise by up to six degrees by the end of the century switzerland's forests are under threat one growing danger is the lack of water leading to drought stress. stephan fluking manages the forest some less if you've been on nola and in the center of the country he's pessimistic. climate change means that some tree species are no longer suited to this area in the long term during the dry summer season beech trees can no longer draw the water up to their crowns the trees then begin to draw it from the top downwards. while the lowlands do still have areas with good growth conditions for the beach here mark green by the end of the century many will be in a far worse than state mount read the best conditions then will only be found at