MARTIN BOND / SCIENCE PHOTO LIBRARY MARTIN BOND / SCIENCE PHOTO LIBRARY
Rooftop solar heat collectors (large black panels) that are using the heat in sunlight to heat water supplies for each house. This saves energy and reduces heating costs. It also avoids the use of power-generation methods that produce pollution, such as burning fossil fuels. Photographed in Stettlen, near Berne, Switzerland, in June 2005.
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