Scientists who venture into rainforests and bat caves explain how viruses, like Covid-19, spill over from animals to people, and what we must do to stop the next pandemic.

Scientists warn that to slow climate change, we need to change how we farm and what we eat.

Plant-based meats may be high tech, but the ideas behind them have been around for decades.

In the 1960s, fears of overpopulation sparked talk of population control. So what happened?

About half a million children have dangerously high lead levels in their blood, mostly from exposure to peeling paint and contaminated dust. The fight over who should clean it up has lasted for decades.

There are now so many wild horses on public land – nearly 100,000 -- that they have become caught in a battle between the government, ranchers and environmentalists.

In the 1980s, rising public awareness about waste was fueled by a bizarre news story about a meandering New York City garbage barge.

Burmese pythons released into the wild by well-meaning pet owners have created a reptilian nightmare in the Everglades.

The increasing scarcity of drinking water is beginning to capture the world's attention -- but surprisingly, an innovative solution might just be found in one of the Earth's driest places.

In the latest installment of our “What Happens Next” series examining the future of society, we visit Medellín, Colombia—a city that has reinvented itself over the past few decades, turning its violent past into a sustainable future by transforming its slums.

Increasingly, wildfires affect populated areas. But 30 years ago, it was a huge fire in Yellowstone National Park that stoked media attention and political controversy.

Author Rachel Carson's strike against the pesticide DDT turned her into both an environmental hero and a foil for those who believe regulation has gone too far. That fight is more relevant than ever.

In 1988, the murder of Chico Mendes fueled a movement of activists, celebrities and indigenous peoples that helped to make the rainforest a household name. But what happens now?

In the late 1990s, Princess Diana brought public attention to land mine victims. But, more than two decades after her death, how much progress has been made in the worldwide fight against leftover munitions?

In the 1990s, the federal government reintroduced the gray wolf to Yellowstone National Park. It was considered a big success. And that’s when the real fight began.

The mystery of Colony Collapse Disorder has pushed honeybees into the public eye. But the story of their plight -- and its impact -- is much more complicated.

The 1989 earthquake that shook San Francisco sent out a wake up call that continues to echo across the country.

In the summer of 1981, the Mediterranean fruit fly spread through California’s Santa Clara Valley, infesting backyard fruit trees and threatening the state’s $14 billion agricultural industry.

At the height of rush hour on August 1, 2007 in Minneapolis, Minnesota, a bridge carrying eight lanes of I-35W over the Mississippi River suddenly collapsed, sending cars trucks plunging into the water below.

On a cold March night in 1989, the tanker Exxon Valdez ran aground off the coast of Southern Alaska, spilling 11 million gallons of crude oil into the waters of Prince William Sound and creating one of the worst oil spills in American history.

In 1978, toxic chemicals leaking from an old landfill thrust an upstate New York community called “Love Canal” into the national headlines, and made it synonymous with “environmental disaster.”

Hurricane Katrina devastated the Gulf Coast in 2005, and Louisiana’s troubled housing recovery has shaped the response to every major disaster since, including Hurricane Sandy.

In the wake of the 1993 hit movie Free Willy, activists and fans campaigned to release the movie’s star – a captive killer whale named Keiko -- and launched a story Hollywood couldn’t invent.