Like organic produce and hydrogen fuel cells, environmentalists come in all shapes and sizes. These four green advocates work in different ways but they share a single goal: taking care of the planet.
In addition to being a frequent guest on The Oprah Winfrey Show, Dr. Mehmet Oz is the vice chair and a professor of surgery at Columbia University as well as medical director of the Integrated Medicine Center and director of the Heart Institute at New York Presbyterian/Columbia Medical Center. He has written four New York Times bestsellers, and next month his new book,You: Being Beautiful, arrives in bookstores. In the first of two parts, Oz talks about sleeping problems and how to overcome them.
