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Renewable energy has become a $220 billion a year industry. But to significantly slow climate change, the power of wind, solar and other renewable sources must vastly expand. Some say the tech breakthroughs needed are on the horizon, though a top economist sees a tougher road ahead.

What rights do participants in an airline's frequent-flier plan have to their miles or points? That's the question before the U.S. Supreme Court on Tuesday, when the justices examine whether, and under what circumstances, frequent fliers can sue in these disputes.

The young ruler of North Korea stunned the world when he ordered his uncle executed. Now, observers are reading the tea leaves for a sign of what's to come.

Two Marine Corps generals have been asked to resign over an incident in Afghanistan a year ago. Taliban insurgents made their way onto a sprawling base and attacked NATO forces. Two Americans died and six Marine fighter jets were destroyed. The two generals reprimanded in the matter were found to bear responsibility for underestimating the threat to base security.

In Vancouver four years ago, athletes who grew up in the Adirondack Mountains in upstate New York accounted for about 1 in 10 medals won by the U.S. In this region, the Olympics don't seem like a pipe dream, and they don't seem like ancient history — they're just sort of what people do.

A tightly-fought Australian general election campaign reaches its climax on Saturday — and the major issues will be familiar to an American audience. With little to choose between the economic policies of the two major parties, immigration and same-sex marriage are top of the news agenda.

History is being made Tuesday in Sochi, as women's ski jump makes its debut as an Olympic event. While men have competed in ski jumping for nearly a century, women have not been included in Olympic competition. They've been seeking equality in their sport for more than a decade. Tamara Keith was on hand to report on the day's events.

Bobsled used to be an all-male sport until 2002. Even now, the women only race two-man, not four-man bobsled. Team USA features 2 summer Olympians as brakemen. Lauren Williams is a gold and silver medalist in the sprint. Lolo Jones did the hurdles in Bejing and London.

"Anyone who approaches this logically" would conclude that President Bashar Assad's forces used chemical weapons "on a massive scale" last week, White House spokesman Jay Carney said Tuesday. President Obama is weighing "the appropriate response," Carney added.

Yahoo has redesign some of its major sites — the latest step in CEO Marissa Mayer's dramatic turnaround of the Internet company. Before Mayer interviewed for the job at Yahoo, her career at Google appeared to have stalled. Renee Montagne discusses this with Nicholas Carlson, who wrote a profile of Mayer for the news website Business Insider.