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Recovery efforts in Dujiangyan, China are also focused on hydropower dams around the ancient city. The epicenter of last week's massive earthquake was near the huge Zipingpu dam, cracking its walls. Officials say Zipingpu is structurally safe and are releasing water to decrease pressure. Scientists warn that if the dam fails, the destruction would be even greater than the quake. NPR's Steve Inskeep speaks with NPR's Melissa Block.

Turns out wireless networks aren't wireless at all. And light pulses in fiber optic cables carry your voice around the world. A new exhibition explains the science you hold in your hand every day.

Climate-warming greenhouse gasses from natural gas could be as damaging as those from coal, according to a new analysis.

President-elect Barack Obama has chosen Nobel Prize-winning physicist Steven Chu to serve as his energy secretary. An official announcement is expected in Chicago Thursday.

Sen. Ken Salazar (D-CO) is apparently President-elect Barack Obama's choice to be Interior secretary, a position usually reserved for Westerners. But Salazar is getting mixed reviews at best from environmentalists and public lands advocates, while agricultural and mining interests are relieved.

Utilities want the Supreme Court to reinstate a Bush administration regulation that was overturned by lower courts. The regulation allowed utilities to consider the cost of the cleanest technology and not install it if fails a cost-benefit analysis.

U.S. climate envoy John Kerry is in Beijing to revive cooperation between the world's biggest polluters to fight climate change. NPR's A Martinez talks to Chatham House Research Director Bernice Lee.

Inspired by Morgan Spurlock's fast-food gluttony in Super Size Me, two environmental activists from Canada devised their own experiment. Instead of fast food, Rick Smith and Bruce Lourie absorbed themselves in everyday products like shampoos, soaps and cleaners to find out what kind of damage might be done to their health.

Consumer Reports ranked the Toyota Prius the 2010 Green Car of the Year despite a recall from the world's No. 1 automaker. David Champion, senior director for Consumer Reports' Auto Test Center, discusses the process behind the rankings.

Few places in the U.S. are more threatened by global warming than Everglades National Park in Florida. Park officials say the national park as well as the water supply and flood control for 6 million people who live in south Florida are at risk.