Accelerate the World's Transition to Sustainable Energy - to fight Anthropogenic Climate Change, page-36513

Maybe you have a look at Hydro and Co2 and body of water created, constantly creates GHG, depending on location and heaps of further factors will depend on the amount, but basically ones in hot humidity create the most. Guess what lots create more than an equal ff coal plant. Have a little google. Oh and your point about co2 to make and decommission a nuke also applies to a hydro project.