# Tweet by [@keefmoon](http://twitter.com/keefmoon) on 2009-05-19 13:24:29 > [!INFO] Archived from [original tweet](http://twitter.com/keefmoon/status/1847042850) RT @mikebutcher: a square 200x200 miles collects enough solar energy to power ALL of humanity #futuresummit (via @fredinchina via @azeem)