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Is America ready to wean itself off a long-term addiction to fossil fuels? The disastrous BP oil spill in the Gulf of Mexico has sharpened the debate about sustainable energy strategies across the developed world. John Hofmeister was for years a big player in the global oil industry. He retired as the president of Shell's American business recently but now he says he is ready to talk straight about the world's looming energy crisis. Is big oil part of the solution, or the problem?