Environmental policies are supposed to help clean up the air. But are some eco-policies actually contributing to massive air pollution in developing nations? Well that’s the question some experts are asking after the U.N. recently completed a major study of the so-called Asian brown cloud — a 2-mile blanket of pollution over south Asia — and found that the burning of wood, cow dung, and other biomass is a primary cause of this damaging air. The experts note that poor people in these countries must resort to such fuels to cook, heat their homes, and carry out primitive manufacturing because of intense environmentalist opposition to dams, fossil fuels, nuclear power, and most other development projects, and suggest a re-thinking of these smoggy ideas.