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"When we pull back the curtain now, the mess is disturbing," says House Energy and Commerce Committee Chairman Fred Upton, R-Mich., of the latest revelations. These documents call into question whether contractors can fix the website as promised by the end of November.

Agents at the Bureau of Alcohol, Tobacco, Firearms and Explosives have spent months testing new plastic weapons, and report that the guns can be lethal and hard to detect. The findings come just as a federal law that requires guns to be composed of at least some metal to help people in schools and airports detect them is set to expire.

Previous estimates of the climate-warming gas were based on the rough number of methane-emitting sources on the ground — such as factories, refineries, stoves, swamps, landfills and cattle herds. But by directly measuring levels of methane in the air instead, a new study puts the total much higher.

President Obama leaves Wednesday morning for a week-long tour through three African countries. It's his first extended visit to the continent as president. He'll be making stops in Senegal, South Africa and Tanzania.

A protest in the Russian Arctic has dramatized growing problems with oil drilling there. Every country has a stake in the enormously lucrative search for oil and gas in the Arctic, says professor Lawton Brigham. But pollution from reckless attempts at development are evident on an island near the Polar circle.

Nationwide, many cash-strapped cities have raided funds intended for retirees or have chronically underfunded their pension systems. But despite a budget crunch, Milwaukee's fund has consistently ranked among the nation's top pension programs. Even so, some changes lie ahead for city workers.

Urban farmers are eyeing rooftops that are already green as potential sites to grow food. But there are big obstacles to rooftop farming — from permitting to transporting water and soil to the top of a building.

As the leader of Senate Democrats, Harry Reid has been in a lot of fights — but this one may be different, in that Reid has drawn a line. After a meeting with other congressional leaders and President Obama on Wednesday, Reid said: "The one thing we made very clear ... we are locked in tight on Obamacare."

Bananas are the most popular fruit in America, and demand is growing worldwide, too. But growing bananas requires a lot of pesticides. And a new study shows that some of those chemicals are ending up in caimans living downstream from banana plantations in Costa Rica, where many of the bananas that Americans eat are grown.

Russia is preparing for the 2014 Winter Games — turning a sleepy valley in the Northern Caucasus Mountains into an Olympic village, with brand-new facilities for every Alpine sport. Officials say it will be a world-class destination for winter-sports enthusiasts long after the Games are over. Environmentalists say it's an ecological disaster in the making.