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Increasing U.S. coal exports to China doesn't necessarily mean global emissions will rise. As demand abroad drives up coal prices at home, it could prompt U.S. utilities to switch to cheaper and more environmentally friendly natural gas. And that might alter the politics of climate change in the U.S., an expert says.

As the world's population tops 7 billion people, population experts are worried about inevitable increases in cars, computers, bigger homes and a drain on resources. In an effort to combat this, one California company is producing small, energy-efficient homes — some as tiny as 300 square feet.

The social media giant's stock started trading publicly for the first time today. Interest was huge — more shares traded hands than on the first day of any other initial public offering.

South Korea conducts live-fire military drills Monday near its disputed sea boundary with North Korea, despite Pyongyang's threat to respond with a "merciless" attack. The exercise took place in the same area of the Yellow Sea that was the targeted by a North Korean artillery attack in 2010.

Strategists, pollsters and billionaires are discovering that they can have a much bigger impact on the election through outside groups that can raise unlimited amounts of money. These political money men are already changing the way elections are won and lost.

Host Rachel Martin talks with NPR sports correspondent Mike Pesca, who has an off-speed pitch on the week's sports news.

Roughly half of Facebook's users check in on smartphones and other mobile devices every month, but so far the company isn't making money on mobile. That's one of the potential pitfalls for the company as it prepares to sell its stock to the public.

Brown was a music industry survivor, but he wasn't as indestructible as he seemed to believe. RJ Smith's new biography The One presents the soul godfather as an unparalleled performer undone by drugs and violence.

Russian researchers in Antarctica are on the verge of piercing a hole through two miles of ice into an ancient lake, untouched by the light of day for some 20 million years. But it'll be a delicate process to break through without disturbing the pristine waters. Guest host David Green speaks with Antarctic researcher John Priscu about the process.

On New Year's Eve, don't open the front door in Denmark, look out for falling furniture in Italy and chew lightly when eating black-eyed peas in the South of the U.S.