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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.

Want to top your pancakes with something other than maple? The alternatives vary, depending on the types of trees in a region. There's Kahiltna birch syrup made in Alaska, blue spruce pine syrup from Utah and Georgian black walnut syrup.

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.

Some argue that workers should be able to move more freely in a global economy. But others push back, saying an influx of labor into the richest countries would devalue workers' worth and actually hurt more in the long run. A group of experts debates for Intelligence Squared U.S.

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.

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."

AIPAC has blanketed Capitol Hill with lobbyists trying to convince Congress to authorize a military strike against Syria. But despite its close ties with many lawmakers, the lobby has had little success.

In fashion's first hackathon, developers had just 24 hours to build an app for the industry — the finalists will be presented on the runway at New York's Fashion Week. "Right now the industry could really use some innovation," says Decoded Fashion founder Liz Bacelar.

The jobless rate was 7.9 percent vs. 7.8 percent in December. But new data show job growth has been better than first thought and ended 2012 on a strong note. Overall, it's estimated that several hundred thousand more jobs were created in 2011 and 2012 than previously thought.

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.