The net global precipitation will increase in a more energetic climate. Cycling more fresh water should be a net benefit, even at the short-term consequence of disrupting patterns of precipitation we've adapted to.
...as an aside, I've always felt it was a great waste that the Army corps of engineers spills the water from Detroit lake the day after Labor Day. Presumably they do this to be more prepared to control flooding if they get extreme rainfall. I'd rather see the turbines cranking at 100% capacity to draw the water levels down. I wonder how many kWh are spilled, and what percentage that represents compared to what is produced in a year?
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