ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY. ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY.
Forester in the Black Forest, West Germany, examining yellowing needles from a damaged spruce. The damage is associated with acid rain, or the lowering of the pH levels (7 is normal) by the addition of manmade pollutants into the atmmosphere. These consist of sulphur dioxide and oxides of nitrogen from the burning of fossil fuels.
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