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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.

The first day of competition at the Sochi Olympics took place Thursday on the slopestyle course, as snowboarders took part in qualifying runs. Crowds tangled with logistical issues, but for the most part, the day was a success.

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.

In a special election to replace retired GOP Congressman Jo Bonner, one candidate believes in "dying on the hill" to repeal Obamacare. His opponent wants to go to Washington to "get something done."

President Obama and Mitt Romney are scheduled to address the National Association of Latino Elected and Appointed Officials conference in Orlando. Robert Siegel speaks with Arturo Vargas, executive director of the group, about what issues attendees would like to hear about.

California is the top dairy-producing state in the nation. And its dairy farmers are split over the impact of the latest farm bill's impact on the government's antiquated milk price support system.

Shortly after the Colorado shootings, a Denver 18-year-old named Morgan Jones started a thread on the social media site Reddit. It built through the night into a minute-by-minute chronicle of tragedy.

Host Scott Simon talks with John Podesta about the transition from the first Obama administration to the next. Podesta served as co-chair of President Obama's 2008 transition team. Podesta, who currently chairs the Center for American Progress, says first terms always emphasize big building blocks of legislation, whereas second terms focus on implementing good management.