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Certain microbe species were eliminated locally.
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Still more sediments recorded irreversible losses. Acid rain, caused by pollution reacting with water in the atmosphere, diminished the calcite layers. The amount of fly ash increased eightfold in less than five years. A lighter form of nitrogen - a molecular signature of burning fossil fuels - proliferated. Other shifts weren’t necessarily new, but they appeared at scales ten or a hundred times greater than anything the lake had seen before. The element rarely occurs naturally on this planet it could only have come from nuclear weapon tests happening thousands of miles away. The sharpest sign of change was a surge in radioactive plutonium that started in Crawford Lake’s mud around 1950.