Other than the massive areas of land they flood and destroy (but you don't live there right?), or the fish that can no longer swim upstream, or anyone downstream that has to deal with reduced flow...
Conveniently ignoring nuclear power.
Re:The World’s Aging Dams
by Ensorceled on Tuesday February 09, 2021 @11:31AM
(#26079413)
MOST. I'm from Ontario and we get 58.3% of our electricity from clean, safe CANDU reactors. Why did you assert I'm ignoring nuclear power? It has nothing to do with Dams being LESS polluting than MOST of the alternatives.
If the choice is between environmental damage from fracking or coal mining and deaths from coal pollution or flooding a valley somewhere...