Sulfates released into the atmosphere to cool the planet would reduce water evaporation and therefore reduce rain. The article gets into
Massive satellite arrays to reduce insolation could avoid this problem. Their orientation could be changed in a 24 hour cycle so as to let thru more light when the light will strike water and less light when the light will strike land. They could even most reduce light over deserts so the deserts wouldn't dry out as much. This process could even be tuned to let in more light on areas of the ocean from which evaporated water is most likely to precipitate on land. So, for example, let in more light where the prevailing winds off of the coasts of northwest Canada and Alaska will carry the water over land.
Given sufficiently cheap photovoltaics and robotic construction machines the resulting electric power could be used to drive desalinators and water pumps to move massive amounts of clean water far in land. Imagine desalinators on the coasts of Oregon, Washington State, and British Columbia pumping water hundreds of miles inland to irrigate agriculture. The water then would evaporate from farm fields and rain down again even further inland.
Another idea: picture offshore floating structures covered with solar panels that use their energy to pump water up pipes a couple of hundred feet to be sprayed into the air. They could increase water evaporation. Probably this would cost far too much for the amount of water generated. But in a world with really cheap energy and huge numbers of robots a mechanized means of doing evaporation just where you want it might be affordable.
|Share |||Randall Parker, 2013 November 03 09:53 AM|