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In Niger, two devastating droughts have killed hundreds of thousands of people. Climate scientists don't know whether global change will make West Africa wetter or more parched. Growing trees — which Niger is doing — is a way to prepare for either development.

The Immigrant Experience from an Arab Point of View

President Obama's looming decision on whether to boost U.S. troop levels in Afghanistan by more than 50 percent could be a defining one for his administration — and the country. The moment is fraught with historical parallels, from Vietnam to Iraq.

Documentary Turns the Camera on Famous Director

In his first address to the United Nations General Assembly, President Obama called on world leaders to step up and not "wait for America to solve the world's problems alone." He also sought to set a new tone in U.S. relations — one that separates his administration from that of his predecessor, George W. Bush.

President Obama brought a fresh message of cooperation and issued a challenge to the world in his first speech Wednesday to the U.N. General Assembly, urging leaders to step up to their responsibility in solving global problems.

A confidential report by Gen. Stanley McChrystal, the top U.S. and NATO commander in Afghanistan, warns that a new strategy and more troops are necessary to avoid failure there. Here's a look at the report, the early reaction to its findings, and what it means for the U.S. effort in Afghanistan.

After a bloody summer for U.S. troops in Afghanistan, President Obama is pondering new tactics, but says, at least for now, no new troops will be sent to the region. Experts just back from Afghanistan offer a close-up look at what troops face in combat, and how new tactics and policies are playing out on the ground.

More troops and resources are needed in Afghanistan to avoid failure, the top U.S. commander in Afghanistan, Gen. Stanley McChrystal, writes in a confidential report being reviewed by the Obama administration.

A year ago, the nation's financial system was in peril. Over the course of days, credit markets were paralyzed, storied investment banks went bust, and it seemed the world might be on the verge of a catastrophic depression.