Joby Warrick

Satellite images point to a construction spree for ICBM launch tubes that could a signal a major expansion of Beijing’s nuclear capabilities, though some could be decoys.

The system will give Tehran an unprecedented ability to track potential military targets across the Middle East and beyond, according to current and former U.S. and Middle Eastern officials briefed on details of the arrangement.

Despite a self-imposed moratorium on testing its most advanced missiles over the past two years, North Korea has never halted its efforts to build powerful new weapons.

At high mountain altitudes where most glaciers are found, temperatures are rising faster than in the valleys below, with all signs pointing to still-higher increases in the decades ahead.

Greenhouse gases in the Earth's atmosphere reached another grim milestone this year as carbon dioxide levels surpassed the symbolic threshold of 400 parts per million across much of the planet.

Relatively few tropical storms ever make it as far north as Greenland, the ice-covered island that straddles the Arctic Circle east of Canada. But the ones that do appear to be inflicting serious damage -- and not just to Greenland.

As early as this spring, the Environmental Protection Agency is expected to invoke a rarely used legal authority to bar a Canadian company, Northern Dynasty Minerals Ltd., from beginning work on its proposed Pebble Mine, citing risks to salmon and to Alaska's pristine Bristol Bay. How did it get to this point?

New scientific studies this week have shed light on the speed and the mechanics of West Antarctic ice sheet melting, documenting an acceleration that, if it continues, could have major effects on coastal cities worldwide.

Osama bin Laden hid in his bedroom for at least 15 minutes as Navy SEALs battled their way through his Pakistani compound, making no attempt to arm himself before a U.S. commando shot him as he peeked from his doorway, according to the first published account by a participant in the now-famous raid on May 2, 2011.