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PLUIES ACIDES --- ENVIRONNEMENT --- POLLUTION
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Air --- Pluies acides --- Pollution --- Aspect economique
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Oiseaux aquatiques --- Zones humides --- Oiseaux --- Acidification --- Pluies acides
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Air pollution. Air purification --- Industrial chemistry --- zure regen --- Pluies acides. --- Zure regen.
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Acid rain --- Pluies acides --- Acid rain. --- Government policy --- Politique gouvernementale --- Government policy. --- Canada. --- Canada
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Chimie de l'atmosphere --- Forets et sylviculture --- Pluies acides --- Pollution, lutte contre la
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