DAN GURAVICH / SCIENCE PHOTO LIBRARY DAN GURAVICH / SCIENCE PHOTO LIBRARY
Industrial pollution. Scum and froth on the surface of a polluted river as it flows past a paper mill. Paper mills use a variety of chemicals during the treatment and manufacture of wood pulp and paper. The waste products from this process are being released into the river and air, damaging the environment. Photographed at Reversing Falls, St John, New Brunswick, Canada.
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