"All the problems we face can be dealt with using existing technologies. And almost everything we need to do to move the world economy back onto an environmentally sustainable path has already been done in one or more countries." –Lester R. Brown, Plan B 3.0: Mobilizing to Save Civilization
Here's a clip of Lester Brown from PBS's Journey to Planet Earth series on Plan B: Mobilizing to Save Civilization. Posted March 29, 2011.