10 green royals
7. Prince Hassan Bin Talal of Jordan
A supporter of the DESERTEC Foundation, which promotes massive solar power projects in North Africa, Prince Hassan (brother to Princess Basma) is a staunch advocate of clean, renewable energy. He delivered a swift kick (ahem) to fossil fuels by declaring that they are “a threat to our natural living conditions.” Last year he gave a speech [PDF] before the United Nations General Assembly explaining how environmental issues relate to human security. For his efforts on behalf of the environment, this anti-petroleum prince was recognized as a 2007 Champion of the Earth by the U.N. Environment Program.