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28th April 2008, Palm Springs, California. The wind farm near Palm Springs produces an alternative sources of energy. Wind turbine generators are much less harmful to the environment than burning fossil fuels, but they do require average wind speeds of at least 21 km/h (13 mph). The largest of these windmills stands 150 feet tall with blades half the length of a football field.PHOTO © JOHN CHAPPLE / REBEL IMAGES.john@chapple.biz www.chapple.biz
