You know her best as Elaine, the Seinfeld sidekick with the rotating crop of boyfriends. You know him as a writer and producer for shows like "Frasier" and "The Single Guy." But long before fortune smiled down on Julia Louis-Dreyfus and Brad Hall, her husband, the pair were committed environmentalists. She has done work for nearly a dozen environmental organizations, including Natural Resources Defense Council, Heal the Bay, and Trust for Public Land; he is helping lead the effort at the Environmental Media Association to get energy-guzzling Hollywood studios to reform their wasteful practices. Together, they are key players in Hollywood's green vanguard. So what's up with that Porsche in their driveway? Amanda Griscom talks with the couple at their new, eco-friendly (second) home about the environment, Hollywood, the energy crisis, guilt, and more -- only on the Grist Magazine website.