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Four years of too little water is killing millions of trees in the Sierra, yet some giant sequoias still thrive. Tree-climbing scientists are exploring sequoias branch by branch to find their secret.

It started in July. The callers live in Gourd Island, and they were hoping to share an important message that they say was being ignored by their local authorities.

When Paul Greenberg started fishing as a kid in the '70s, he didn't have to think twice about dwindling wild fish populations. That was before the world nearly doubled its fish consumption. Four Fish is Greenberg's investigation into the future of the last wild food.

Two documentaries — one involving a pre-WWII home movie, the other dispatches from the Amazon rainforest — have much in common.

A scientific discovery could forever change China and the U.S. industrial balance.

The cause for the spill is still unclear. What's known is the type of oil that was piped: tar sands oil, also called diluted bitumen. It's a lot harder to clean up than conventional oil.

TikTok is more than just goofy dances and challenges. Here are some of the most widely viewed — and engaging — global TikToks of the year.

The manufacturing plant is in the east German state of Brandenburg, one of the most water-scarce regions of the country. Residents fear an expansion would lead to a water shortage.

Sometime today, the global population is forecast to hit 8 billion. The U.N. calls it a milestone for humanity, made possible by advances in public health and medicine. But there are also challenges.

Brazilian samba musician Rogê already conquered Rio de Janeiro. He's here to give the U.S. a taste of Brazil with his album Curyman.