Kevin Leecaster@HistoPol
Evaporation reduction definitely, but the others seem speculative and don't strike me as very possible because of the scale differences between some floating islands and such broad scale things as flashfloods not to mention ambient humidity.
Putting PV roofs over canals is already saving acre feet of water in a few arid irrigated agricultural regions, but it's just in its infancy so far.
All GNU social JP content and data are available under the