America’s growing wind power industry is now facing new challenges — resistance to the wind turbines. Wind power critics have raised concerns about visual pollution, such as on Cape Cod and upstate New York where rows of wind turbines constructed or proposed can impact scenic skylines. America’s Defense Department has raised concern about the impact of multiple wind turbines on defense radar systems. Now, conservationists and coal advocates have asked Congress to seek an assessment of how many bats and birds are maimed or killed by wind turbines’ blades before the industry grows too large.