Not a link, but I do know that discharging a bunch of hot water into a stream that is typically cold can wreak havoc with the local fishies that might be adapte

Not a link, but I do know that discharging a bunch of hot water into a stream that is typically cold can wreak havoc with the local fishies that might be adapted to a certain environmental regime. Like anything, though, a little bit of dumping is just fine, it's when we scale to the size of human civilization that it becomes a problem.