SIMON FRASER / SCIENCE PHOTO LIBRARY SIMON FRASER / SCIENCE PHOTO LIBRARY
Air pollution. View of trees killed by a combination of acid rain and other pollution. Emissions from nearby steel plants and oil refineries have exacerbated other environmental factors - such as the salt-laden breeze from the sea not far away - in killing these trees over a 30-year period. Photographed at Mynydd Dinas near Port Talbot, Wales.
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