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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.

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.

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.

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.

Water wells and streams in Leroy Township, Pa., have been bubbling up with methane gas in the past few months. The state's Department of Environmental Protection blames nearby natural gas fracking operations. A local well operator has installed water filters for residents and says the problem has been fixed.

The Obama administration and the president's Chicago-based re-election campaign are trying to minimize the risks of offending teachers and union members by carefully navigating the tricky waters between Mayor Rahm Emanuel and the striking teachers.

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.

Over the past two decades, the landlocked city of Brownsville, Texas, has become the hub of the U.S. ship recycling industry. Ships from tankers to aircraft carriers are dismantled and stripped of reusable metals. And despite the world economic slowdown, it's still a highly lucrative business.

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.

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.