But will it make a difference for cleaning up pollution?

How did people find out where their local boundaries were before there were reliable maps?

“Forever chemicals,” also known as PFAS, have been found in 43 states so far, turning up in milk, eggs, and fish.

Over 20 countries have high-speed train travel, carrying 1.6 billion passengers a year. The United States is lagging behind.

We call futile victories "pyrrhic," after an ancient Roman battle. But that battle may have been misinterpreted--or had a different conclusion altogether.

Viewing climate change through a national security lens makes a certain amount of sense -- but it won't entirely solve the problem.