Sizing up our nitrogen footprint

Nitrogen presents a paradox–we need it to live, and yet too much of it creates problem. Nitrogen pollution, mainly from agriculture, fouls waterways and degrades air quality. That’s why researchers have created a tool to help consumers understand the impact of their dietary choices on their nitrogen footprint. Learn more in my story for NPR’s The Salt.

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All plants need nitrogen to grow, but much of it leaks out into the environment, where it causes problems.
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