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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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Elephant bones scattered on the savannah

The Circle of Life

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No Silver Bullet
Elephants at a watering hole at Mpala Research Centre in Laikipia County, Kenya

Around the Watering Hole

A Sunny Outlook for Solar

National Recognition

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