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The federal government plans to build several hydrogen hubs around the country. The goal is to find a cleaner replacement for fossil fuels. But there are challenges in how hydrogen is produced.

Countless movies were filmed there, including Tarzan and Creature From the Black Lagoon. With its wildlife and freshwater springs, Silver Springs in Central Florida was one of the state's most popular tourist destinations. Those waters have receded now as the delicate ecosystem suffers from problems that threaten the entire state.

Energy companies are using a drilling technique known as fracking to extract natural gas underground. Many people raise questions about the environmental impact, but there is no doubt fracking has produced lots of natural gas and driven down the price. That has led energy-hungry manufacturers to build plants in fracking hot spots like Texas and Pennsylvania. But even in old factories — far from the drilling or even the pipelines — cheap natural gas is providing a competitive edge.

Toads have made their way to just about every corner of the world, even potentially Antarctica, something deemed unthinkable in the past. What's behind this vast toad migration?v

Justice Department data show that the amount of drug-related assets confiscated since 2004 has tripled, from $567 million to $1.6 billion. Critics claim some law enforcement agencies have become "addicted to drug money" in their quest to fill their own coffers.

There's a massive area in the Gulf of Mexico that's so low in oxygen, aquatic life can't survive there. Many say it's mainly from excessive fertilizer that runs off from Midwestern farms.

Rachel Weaver worked for the Forest Service in Alaska where she scaled towering trees to study nature. But in 2006, she woke up and felt like she was being spun in a hurricane. Her memoir is Dizzy.

London's "allotment" gardens are an unusual system of community gardens across the city. Tended by immigrants, retirees, chefs and fans of fresh food, they make up a kitchen community like no other.

See what albums NPR listeners picked in our year-end poll for the best music of 2013.

In 1992, a cargo ship container tumbled into the North Pacific, dumping 28,800 toys into the ocean. What happened to those toys led writer Donovan Hohn on a worldwide journey filled with beachcombers, oceanographers, ship captains and environmentalists.