ScienceDaily: Substantial amounts of the greenhouse gas methane are released not only from large tropical reservoirs but also from run-of-the-river reservoirs in Switzerland, especially in the summer, when water temperatures are higher. This was demonstrated by Eawag scientists at Lake Wohlen, near Bern — a finding which slightly tarnishes the reputation of hydropower as a climate-neutral way of generating electricity. When they first saw the data, environmental chemist Tonya Del Sontro and her …