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Carbon dioxide levels in the atmosphere cycle up and down as plants take it up in the summer and let some of it out in the winter. Over the past 50 years, these "breaths" have gotten larger, as plants in the Arctic are taking up more carbon dioxide during the warmer summers.

The country also known as Burma is emerging from decades of authoritarian rule. But 25 years ago, in the middle of that dark period, there were six weeks of hope. Demonstrations brought millions onto the streets until a harsh crackdown left thousands dead and landed thousands more in prison.

Calling a lawsuit's potential results "absurd" for cities around the United States, Major League Baseball asked a federal judge to dismiss a challenge to its antitrust exemption filed by San Jose. The city hopes to lure the Oakland A's to relocate there.

The U.S. Postal Service lost some $16 billion last year and continues to bleed red ink. Congress has been unable to agree on a plan to turn things around. The latest proposal would allow the post office to end Saturday delivery in a year, and enable it to ship wine and beer.

With the implementation of the new Common Core standards, parents across the country will notice a few changes in their kids' math homework.

The Lowertown neighborhood of Paducah, Ky., once riddled with crime and dilapidated homes, is now a haven for artists and a thriving community life. Artists and non-artists alike have been moving to the neighborhood since 2000, when the city decided to create the Artist Relocation Program.

Astronaut Sally Ride has served as a role model for young women as the first American woman in space. It's for that reason she's one of the 16 people named as recipients of the Presidential Medal of Freedom. Ride will receive the award posthumously — she died last year at the age of 61.

Two years ago, Libya was turned upside down by the Arab Spring movement. David Greene talks to David Kirkpatrick, Middle East correspondent and Cairo bureau chief for The New York Times, about the state of governance and security in Libya.

Recent Amber Alerts startled millions of mobile phone owners and left them confused. The wireless emergency alert system just rolled out for mobile phones earlier this year. Some child advocates worry that the alerts' lack of context may cause people to turn them off.

The president is expected to get questioned about "NSA leaker" Edward Snowden, U.S. spying programs, relations with Russia, the economy and other issues. It will be his first major give-and-take with the press corps since late April.