January 31, 2020
A wind farm, when installed on agricultural land, has one of the lowest environmental impacts of all energy sources:
It occupies less land area per kilowatt-hour(KWH) of electricty generated than any other energy conversion system, apart from rooftop solar
energy, and is compatible with grazing and crops. It generates the energy used in its construction in just 3 months of operation,
yet its operational lifetime is 20-25 years .
Greenhouses gas emissions and air pollution produced by its construction are tiny and declining. These are no emissions or pollution produced
by its operations .In substituting for base-load coal power, wind power produces a net decrease in greenhouse gas emissions and air pollution,
and a net increase in biodiversity.
Moden wind turbines are almosts silent and rotate so slowly (in terms of revolutions per minute) that they are raely a hazard to birds .
Studies of birds and offshore wind farms in Europe have found that there were very few bird collisions. Several offshore wind sites in Europe
have been in areas heavily used by seabirds . Improvements in wind turbine design , including a much slower rate of rotation of the blades and
a smooth tower base instead of perchable lattice towers . have helped reduce bird mortality at wind farms around the world.
However older smaller wind turbines may be hazardous to flying birds . Birds are severely impacted by fossil fuel energy, examples include
birds dying from exposure to oil spills , habitat loss from acid rain and mountaintop removal coal mining, and mercury poisoning.