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NPR's Ayesha Rascoe asks Rae Wynn-Grant about her journey to becoming an ecologist. Grant writes about it in her memoir, "Wild Life: Finding My Purpose in an Untamed World."

A mysterious die-off of freshwater mussels has biologists scrambling to figure out a cause. Freshwater mussels are critical to river ecosystems and to U.S. water supplies.

Many economists and business leaders are raising alarms about falling birthrates. But advocates for lower human populations say a less crowded world will be happier and more sustainable.

Verlon Jose, vice chairman of the Tohono O'odham Nation, says President Trump's proposed border wall would cut through the reservation, with negative impacts.

From her messy office at the Smithsonian, ornithologist Roxie Laybourne changed aviation and crime investigation. NPR's Scott Simon talks with Chris Sweeney about his book, "The Feather Detective."

For generations, the rubber tappers of the Amazon have gone about their business in a way that preserves the rain forest. Today, they are increasingly in conflict with criminal logging gangs.

A Trump executive order temporarily pauses leases and permits for offshore and onshore wind projects. Wind advocates say an offshore wind freeze could threaten states' climate goals and jobs.

A Bloomberg News/NPR investigation found large U.S. coal companies used bankruptcy and asset transfers to move old mines to shaky new owners, putting at risk federally mandated land reclamation.

Grocery stores are full of food with labels like organic, cage-free or fair trade that appeal to a consumer's ideals. But there's often a gap between what they seem to promise and what they deliver.