anemometer - a device that measures wind speed.

atmosphere - the blanket of air that surrounds Earth.

climate – weather in a region over a long period of time.

ecology – the study of the relationships between people, plants and animals and their environment.

fossil fuels – coal, oil, and natural gas, derived from prehistoric plant and animal remains trapped in rock.

generator – a device that produces electricity such as that provided by fuel or by wind.

greenhouse effect – The warming of the earth's atmosphere caused by hazardous pollution from burning fossil fuels.

kilowatt – a unit for measuring electrical power; one kilowatt is the rate at which about 100 homes use power.

megawatt -   a unit for measuring electrical power ; one million watts of energy.

pitch control – changing the angle of blades to control the speed at which they spin.

power grid station – a plant where electricity is generated.

renewable energy – power from natural sources that cannot be used up, no matter how much is used, such as the wind and sun.

turbine –  a machine powered by rotating blades that can be turned by wind, water, gas or steam which transforms to produce electric current on a generator.

wind farm – an area of land with a large number of electricity-generating windmills or wind turbines.