The folk duo Indigo Girls is gearing up to hit the road Thursday with Native American activist Winona LaDuke for a two-week Honor the Earth tour. During the tour (which will end, appropriately enough, on Earth Day, April 22), Grammy Award-winners Emily Saliers and Amy Ray will talk -- and sing -- about the connections between the environment, energy, Native American issues, and U.S. foreign and domestic policy. Check out what Saliers has to say about the origins of her environmental awareness, the life of an artist-activist, her automotive inclinations, and more, only on the Grist Magazine website.