The New York Times today has an opinion piece suggesting that orbital solar collectors could send power to Earth facilities by means of radio waves. (http://www.nytimes.com/2008/07/23/opinion/23smith.html?th&emc=th) Is this really practical? What are the safety concerns? If such a collection system could be built, would it be possible to place it (them) between the Earth and the sun, thus helping to cool Earth's surface? Any opinions welcome, thanks.