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The amount of carbon dioxide in the atmosphere has crossed the "psychological threshold" of 400 parts per million. That number is one of the clearest measures of how humans are changing the planet by burning fossil fuels.

A heart cockle shell has been found to let in light through a design that resembles fiber optic cables. This could inspire everything from helping coral survive to designing new camera lenses.

To get away from a strict religious family, Justice fled to New York in 2001 to busk on the streets.

Leafy greens aren't easy to come by in the desert, and when the Reid Park Zoo in Tucson welcomed five new elephants, they quickly realized they would need help locating branches for the pachyderms to snack on. So, they put out an open call to area residents. They asked for African sumac, mesquite, mimosa and fig leaves, among other plants. Audie Cornish talks with the zoo's general curator about his crowd-sourcing for elephant snacks.

Most English holly grown commercially in the U.S. is from Oregon and Washington. It is a quintessential symbol of Christmas but it is also invading some forested areas.

AG Raoul joins 19 other Democratic attorneys general in filing 2 lawsuits.

Hundreds of papers joined with the Boston Globe today in publishing editorials that express concern with President Trump's approach to the press.

Climate change advocates heaped praise on Minnesota Governor Tim Walz

NPR's Michel Martin speaks with Sherrilyn Ifill, of Howard University School of Law, about the opening the 14th Amendment Center for Law and Democracy.

A toxic algae bloom is killing fish, turtles and dolphins and discouraging tourists from visiting Florida's Gulf Coast. It's not the first such event, but it is especially intense.