Acid rain. Long-term data show lingering effects from acid rain.
Krajick
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D015258:Acid Rain / Q000009:adverse effects* / Q000331:legislation & jurisprudence; D000393:Air Pollutants; D000818:Animals; D017753:Ecosystem; D005399:Fishes / Q000502:physiology; D005618:Fresh Water; D010933:Plankton / Q000502:physiology; D012987:Soil; D014197:Trees / Q000502:physiology; D014481:United States
D015258:Acid Rain; D000393:Air Pollutants; D012987:Soil