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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.

NPR's Steve Inskeep speaks with security expert Juliette Kayyem of Harvard's Kennedy School about domestic security in a time of war.

Across the Midwest this summer, scientists are wading into 100 streams to collect water samples and check cages for fish eggs. It's part of a large study to understand how pesticides and agricultural chemicals from farms are affecting the nation's streams.

Guinea pigs are popular pets in the U.S., but in parts of South America, they're a delicacy. Some environmental and humanitarian groups are making a real push to encourage guinea pig farming as an eco-friendly alternative to beef. And the animals are also showing up in more U.S. restaurants.

By October, the state will have the most ambitious commercial food waste ban in the U.S. Institutions that produce more than a ton of waste a week will have to find new uses for their scraps.

Stanford University's decision to stop direct investments in coal mining companies is encouraging student-led divestment movements at other universities. Chloe Maxmin of Divest Harvard discusses her hopes following Stanford's announcement. Harvard University has the largest university endowment in the U.S.

If you really want to fight food waste, eat fish heads, the U.N. says. They're nutritious and delicious, but most fish heads get thrown back in the sea as trash or turned into livestock feed.

Nearly a year's worth of rain was dumped on parts of the state in four days this fall. The downpour from the heavens created a slurry on the mountainsides that scrubbed away soil, trees, boulders and buildings. Scientists say the flooding may have been a once-in-a-thousand-years event.

The success of the Oscar-winning film is good for the country's film industry. But critics say the crew didn't take good care of dunes and animal habitats.

A new service in a Portuguese city not only provides commuters with free Internet connections but also helps collect data that make the municipality run more efficiently.