Renewable energy sources could take the world by storm. That is what well-known advocate Amory Lovins envisaged in 1976. He claimed that by the year 2000, 33 percent of America's energy would come from many small, decentralized renewable sources. Decades later, in July 2008, environmentalist Al Gore claimed that completely repowering the country's electricity supply in a single decade would be “achievable, affordable and transformative.” And in November 2009 Mark Jacobson and Mark Delucchi published “A Plan to Power 100 Percent of the Planet with Renewables” in Scientific American, presenting a plan for converting the global energy supply entirely to renewables in just two decades.