ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY. ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY.
Healthy branch of a sitka spruce Picea sitchensis from the Black Forest, West Germany. The photograph was taken to compare healthy specimens & those showing damage associated with acid rain. Acid rain is the lowering of the pH levels (7 is normal) in rainfall by the addition of manmade pollutants into the atmmosphere. These include sulphur dioxide & oxides of nitrogen resulting from the burning of fossil fuels. The impact of acidification on soils, plant & animal life & bodies of water is of growing concern. Photographs E812/011 - E812/026 of damaged specimens show needle yellowing & needle fall.
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