Hydroelectricity causes pollution. Flooding a piece of land causes more conversion of metallic mercury to organic methylmercury. > Increased methylmercury conc

Hydroelectricity causes pollution. Flooding a piece of land causes more conversion of metallic mercury to organic methylmercury. > Increased methylmercury concentrations in water and fish have been detected after flooding of soils associated with reservoir creation (e.g. for hydroelectric power generation) -- https://en.wikipedia.org/wiki/Methylmercury#Environmental_sources https://en.wikipedia.org/wiki/Methylmercury#Environmental_so...