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Okay, here's the deal: "Anthropogenic nitrogen deposition over the past half century has had a detrimental impact on temperate ecosystems in Europe and North America, resulting in soil acidification and a reduction in plant biodiversity."
What this means is that too much nitrogen in the soil can reduce plant growth. Recent increases in soil nitrogen is associated with human-caused pollution and is "comparable to conditions seen in soils exposed to acid mine drainage."
"Recovery from such extreme chemical change could only occur in geologic time, which is why soil is considered a non-renewable resource," said United States Geological Survey (USGS) scientist Jill Baron. The US Environmental Protection Agency (EPA) has found acid soil can directly result from acid rain, which "causes slower growth, injury, or death of forests." Acid rain, says the EPA, "has been implicated in forest and soil degradation in many areas of the eastern U.S., particularly high elevation forests of the Appalachian Mountains from Maine to Georgia that include areas such as the Shenandoah and Great Smoky Mountain National Parks."
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