DAVID WEINTRAUB / SCIENCE PHOTO LIBRARY DAVID WEINTRAUB / SCIENCE PHOTO LIBRARY
Electric car. View under the front bonnet of an electric car, showing the batteries (green, with white caps) used to power the vehicle. A sign (at centre) reads: "Electric cars today, no smog tomorrow". Electric vehicles themselves produce no gaseous emissions, reducing air pollution (such as smog) in towns and cities. The car uses lead-acid batteries. These are cheap to produce, and can be recharged from the electricity mains, but their power output runs down more quickly than some other types of battery. Photographed in Sacramento in California, USA. This town has a public facility which uses solar panels to generate electricity to recharge batteries.
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