There’s a foul wind blowing off Cape Cod. The clean-energy project known as Cape Wind makes more sense than ever, what with the mess in the Middle East and the earth getting warmer by the minute. But resistance to the proposed wind-farm — which would place 130 windmills in Nantucket Sound and provide up to 75 percent of the Cape’s energy at any given time — proves that it really isn’t easy being green. Since Cape Wind was first proposed in 2001, the project has made plenty of powerful enemies (see the sidebar “Enemies in High Places”), including Ted Kennedy,...