Wind power generation is developing rapidly worldwide. As a source of renewable energy, wind power is viewed by many as an attractive alternative to fossil fuels and as a source of energy that can help reduce atmospheric carbon dioxide emissions. At sites with suitable winds, substrates, and transmission infrastructure, secondary environmental barriers to wind power generation include aesthetic viewshed and biological impacts. The most widely recognized biological impacts are bird and bat collisions with wind turbine blades. Other biological impacts include bird and bat electrocutions on the power collection system; collisions with guy-wires used to support meteorological towers; habitat loss caused by construction of access roads and tower pads; and habitat loss caused by wind turbine avoidance behaviors.