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Most cars have catalytic converters to control the exhaust.

One law professor has a theory about the Justice Department's slow response — and it all goes back to a case involving "heavy knitted underwear" from the 1940s.

There was more violence at the holy sites in Jerusalem Friday as Israeli police fired rubber bullets and stun grenades at a crowd near the Al-Aqsa Mosque.

From documentaries to artistic projects, NPR has collected some of our favorite ways to celebrate the Earth and think about what we can do to protect its flora and fauna.

Xiye Bastida was raised in the highlands of Mexico with an understanding that she had to thank the Earth for everything it provided. Now, she's dedicated her entire life to the issue of protecting it.

The cases will be determined on a case-by-case basis, depending on the company. Here's a look at where each of the major U.S. airlines stands.

Prosecutors say Joseph Mahmoud Dibee was a member of the Earth Liberation Front and Animal Liberation Front. The attacks targeted places that were thought to be harming animals and their habitats.

The apparent mass grave seen in satellite images covers a space larger than three football fields. The imagery shows rows of graves stretching away from an existing cemetery in Manhush, near Mariupol.

A cluster of children in Alabama were found to have liver damage.

Ukrainian soldiers are still hanging on in Mariupol while the country waits for more weapons from the U.S. In the southern port city of Mykolaiv, residents are fleeing the Russian attacks.