Human activities add large quantities of nitrogen to the environment, much of which gets washed into streams and rivers.

Like cows and humans, even our rivers can be gassy. A “Nature” paper co-authored by researchers at the Yale School of the Environment last month quantified the methane contributions of all the world’s ...

An aerial view of the rust-colored Kutuk River in Gates of the Arctic National Park in Alaska. Thawing permafrost is exposing minerals to weathering, increasing the acidity of the water, which ...