Roughnecks build a drilling rig at the MEG Energy site near Fort McMurray, Alberta, Canada. In addition to large, open-pit mining operations, tar sands oil can be extracted from the ground by pumping down high-pressure steam. Michael S. Williamson/The Washington Post/Getty Images hide caption

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Canadian Regulators Investigate Mysterious Tar Sands Spills
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Golden lion tamarins are one species that are largely monogamous. Felipe Dana/AP hide caption

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For Some Mammals It's One Love, But Reasons Still Unclear
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Biologists normally look for the hellbender slamander, which is known by the nickname "snot otter," under rocks in streams. But now there's a gentler way: They can take water samples and look for traces of the animals' DNA. Robert J. Erwin/Science Source hide caption

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What's Swimming In The River? Just Look For DNA
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Scientists could use recordings of wildlife to monitor the movements of invasive species like the European starling. Liz Leyden/iStockphoto.com hide caption

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Eavesdropping On Nature Gives Clues To Biodiversity
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The "Giant Tabular Iceberg" floats in Antarctica's Ross Sea in December 2011. Under a proposed new international agreement, large sections of the oceans around Antarctica would become protected as a marine preserve. Camille Seaman/Barcroft Media/Landov hide caption

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Sweeping Parts Of Southern Seas Could Become A Nature Preserve
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Film Rankles Environmentalists By Advocating Nuclear Power
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Jay Keasling (left), speaking with Rajit Sapar at the Joint BioEnergy Institute, is pioneering a technique to develop diesel fuel from yeast. Courtesy of Lawrence Berkeley National Laboratory hide caption

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Put Down Oil Drill, Pick Up The Test Tube: Making Fuel From Yeast
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Global Thermostat's pilot plant in Menlo Park, Calif., pulls carbon dioxide from the surrounding air. The next challenge is to find uses for the captured gas. Courtesy of Global Thermostat hide caption

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This Climate Fix Might Be Decades Ahead Of Its Time
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President Obama unveils his plan on climate change Tuesday at Georgetown University in Washington, D.C. The president laid out his plan to reduce carbon pollution and to prepare the country for the impacts of climate change. Alex Wong/Getty Images hide caption

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Obama's Climate Strategy Doesn't Require Congressional Approval
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The Capitol dome is seen behind the Capitol Power Plant, which provides power to buildings in the Capitol complex in Washington, D.C. Carolyn Kaster/AP hide caption

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Obama To Announce Sweeping Plan To Address Climate Change
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Thierry Chopin from the University of New Brunswick examines a raft that holds strings of seaweed. The seaweed grows around pens of farmed salmon and soaks up some of the nutrients that would otherwise pollute the Bay of Fundy. Richard Harris/NPR hide caption

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How To Clean Up Fish Farms And Raise More Seafood At The Same Time
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Adam Cole/NPR
Gizmo Uses Lung Cells To Sniff Out Health Hazards In Urban Air
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Houston's Petrochemical Industry, Source Of Jobs And Smog
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The Houston Ship Channel is home to a wide range of heavy industry, including chemical processing plants and petrochemical refineries. Richard Harris/NPR hide caption

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Breathing Easier: How Houston Is Working To Clean Up Its Air
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