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Common Chemicals Could Make Kids' Vaccines Less Effective

Researchers found that children whose blood contained high levels of chemicals used in nonstick coatings and stain-resistant fabrics were less responsive to vaccination. The finding suggests, but doesn't prove, that these chemicals may make some children more vulnerable to infectious diseases.

Op-Ed: The Verdict Is In On Climate Change

California became the only state to implement greenhouse gas emission controls in January 2012, but the debate there over climate change continues. University of California history and science professor Naomi Oreskes says the time for bickering over whether or not climate change is real is over.

One Man's Quest To Capture America's Endangered Zoo Animals (With A Camera)

For Joel Sartore, it's a race against the clock to photograph as many animals as he can — before it's too late.

Extreme Weather Rips Through The South

Bad weather moved across the South Sunday night and into Monday morning. Tornadoes were reported in Alabama, Arkansas and Tennessee. In Alabama, some of the worst damage occurred in areas that had already been hit by heavy storms before.

Op-Ed: Canada Must Change XL Pipeline Debate

President Obama rejected Wednesday a proposal to build the Keystone XL oil pipeline from Canada to the U.S. Gulf Coast — generating intense debate in both countries. Murray Mandryk, political columnist for the Leader-Post of Sasketchewan, offers a Canadian perspective on the controversy.

Geoengineered Food? Climate Fix Could Boost Crop Yields, But With Risks

Climate simulations show that massive technological interventions, known as "geoengineering," could protect food crops from some of the damaging effects of global warming. But researchers say local effects are hard to predict, so geoengineering may not be worth the risk.