Wind has the power to generate both electricity and controversy. Advocates say modern wind turbines provide unlimited, pollution-free power. But critics complain the huge machines scar the landscape and pose a menace to wildlife. On our program this week we explore the advancements in the technology and the debate over wind power. Our story begins in Germany, the nation that leads the world in producing wind energy, but where citizen opposition to the proliferation of windmills across the country and troubles getting offshore windmills sited are threatening that status.