JEREMY WALKER / SCIENCE PHOTO LIBRARY JEREMY WALKER / SCIENCE PHOTO LIBRARY
Cooling towers at a coal-fired power station silhouetted at sunset. Coal is burnt to produce steam to drive turbines, which generate electricity. The steam is cooled by cooling water, condensing it and allowing it to rejoin the cooling circuit. The now-hot cooling water is then sprayed into these towers, where most of it condenses, although some escapes as the steam seen rising here.
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