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A new report finds 325 migratory fish species in urgent need of help, including some of the world's most iconic freshwater giants.

Nations' stores of petroleum can dampen price shocks in the short term, but as reserve supplies dwindle, economic pain may continue.

When you're inside a vortex, your body experiences things the news cameras can't capture.

The current Colorado River negotiations process includes all five of the most common sources of conflict in any process seeking compromise.

A new study linking Pittsburgh's air pollution to thousands of deaths each year has been published just as the EPA moves to weaken pollution standards.

There's lots of copper in the ground, but demand is already outstripping usable supply - and the shortfall is likely to get worse.

Premature deaths rise during long-term blackouts, and ERs fill up. Knowing who is at risk and some creative solutions can help.

Premature deaths rise during long-term blackouts, and ERs fill up. Knowing who is at risk and some creative solutions can help.

The war in Iran has cut off diplomatic efforts to limit the country's development of nuclear weapons. Securing that material and equipment in other ways would be difficult and dangerous.

The damage from military attacks on cities can fill the air with pollutants that harm the lungs and stress the heart.