Nutrient pollution fouls lakes and bays with algae, killing fish and threatening public health. Progress curbing it has been slow, mainly because of farm pollution.

Many people in the US eat way more protein than they need. That contributes to excess nitrogen in our water, researchers say.

New catalytic converters can remove toxic chemicals from the exhaust fumes of combustion-engine cars.

A new study quantifies emissions of nitrogen oxides, ammonia, and nitrous oxide from fertilized agriculture over three years.

Farmers are contending with huge spikes in fertilizer prices. The Biden administration is paying US companies to boost synthetic fertilizer production, but there are other, more sustainable options.

Cleaning up the Great Lakes was a big job when the US and Canada undertook it in 1972. Today it’s far more challenging.

An increase in tillage intensity in corn and soybean fields on US farms since 2008 has led to an increase in greenhouse gas from those fields.

Nitrogen availability is declining in parts of the world, research finds. "There is both too much nitrogen and too little nitrogen on Earth at the same time."

The inside of story of a pioneering programme to convert nitrogen into microalgae that can generate sustainable animal feed.

Reviving long-lost legume species could help improve global food security and decrease world hunger.