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A tractor sprays fertilizer or pesticides on a green field.
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MaYcaL via iStock
Synthetic fertilizer has increased the amount of nitrogen compounds in the biosphere, compounds that must be converted by microbes back into nitrogen gas.

A rare atomic fingerprint reveals how ecosystems clean nitrogen pollution

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Beachgoers enjoy the shoreline at Rio Del Mar, Santa Cruz County
Photo Credit
Charles Lester
Beachgoers enjoy the shoreline in front of coastal development at Rio Del Mar, Santa Cruz County. A seawall protects the first row of houses from the rising sea.