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Millennials profess to care about ethical sourcing when grocery shopping. But a study of chocoholics ages 18-35 shows just how different values and behavior can sometimes be.

The herring are spawning in New York's Wynants Kill tributary after a dam was removed. It's seen as an environmental success and is aimed at restoring the river's health.

In 2000, anthropologist Susan Phillips found markings made by hobos near the Los Angeles River. Phillips talks about the possible author of those marks from 1914, one of America's most famous hobos.

One British performance artist does live shows about living with a constant compulsion to say the word "biscuit." Onstage and online, people with Tourette's syndrome are reaching out to clear the air.

Just seven weeks before the opening ceremony of the Olympics, the governor of Rio de Janeiro has declared a "state of calamity." He says the state's government is bankrupt.

Like the U.S., China is battling obesity and climate change. So it's urging citizens to eat less meat — and spreading the word with public service ads featuring Hollywood stars.

A solitary Spix's Macaw was spotted and caught on video flying over Bahia, Brazil. The origins of the bird are unknown, but conservators say its appearance represents "a new hope" for the area.

White House aides acknowledge that the plan, to be announced by President Obama and his counterparts in Canada and Mexico, is a "stretch goal." The commitment goes beyond the Paris climate agreement.

The National Park Service is racing to record soundscapes of each park that capture nature for the ear. "If we start to lose sounds of wilderness, we start to lose a piece of us," one scientist says.

It's the largest found in over a century and is valued at $70 million. How much do sales like this help the country?