The Costs of Free energy
http://www.nipccreport.org/articles/2010/sep/02sep2010a1.html
“to achieve terawatts output from renewable sources, in order to displace massive quantities of fossil energies, will be a slow process, extending over many decades,” and that we should “not place undue hope in new energy technologies to save the world from fossil energies until well after many decades of deployment.”