Kim Fenske drives a bus in Colorado by day, but when he’s not working, he zooms around the mountains in a 2007 Toyota Prius. Fenske, an attorney by training who has also worked as a forest ranger, was an environmentalist long before hybrid cars like the Prius hit the market. In the early 1990s, he ran unsuccessfully for the Wisconsin state legislature on a renewable energy platform. But he recently decided to go one step further and make an environmental statement with his car. “My decision is a very political decision. I want to get people in...