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Salmon move up the Humber river attracts spectators near the Old Mill subway station in Etobicoke ... [+] during their breeding season in Toronto, Canada, on October 11, 2020 (Photo by Anatoliy Cherkasov/NurPhoto via Getty Images) NurPhoto via Getty Images. Researchers from Cornell University published a study in Nature on the adverse ecological effects of hydropower dams. The study examines how these dams block the flow of water, creating large inundated reservoirs of water conducive to the production of methane gas, a key factor of climate change among the greenhouse gases. But hydropower plants also affect the migration of fish. According to NOAA Fisheries , in the US, more than two mil... Full story

24 November