Our examination of modern wind power continues with a look at the United States. We visit Altamont Pass in California, the place where more birds are killed by wind turbines than anywhere else in the world. But California is also home to High Winds, an energy park that even critics of wind power agree is a model on how to do it right. We also talk with Benjamin Bell from GE Energy, the nation’s largest maker of wind turbines, about advances in the technology of capturing the wind, and why its becoming a big business.