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The WWF report asserts that wildlife populations have dropped by a startling percentage since 1970. The details and extent of that decline, however, are more complex than any one number can capture.

Four years of too little water is killing millions of trees in the Sierra, yet some giant sequoias still thrive. Tree-climbing scientists are exploring sequoias branch by branch to find their secret.

A surge of water will roar through the Grand Canyon the week of November 7th as part of an effort to improve the Colorado River ecosystem.Officials with…

Protecting decades-old systems from hackers is like "trying to put air bags into an old car," the government's chief information officer says. The administration proposes $3.1 billion in upgrades.

The song and video, "Make America Great Again," reflect Tolokonnikova's concern about the U.S. election's outcome. "It will influence everybody else's lives outside America," she says.

Martin Luther created one of Christianity's greatest rifts when he denounced the Catholic Church in 1517. But Pope Francis is taking part in the 500th anniversary of the Protestant Reformation.

Some down-ballot candidates are really embracing the nontraditional feel of this election year, especially when it comes to their advertisements.

The kids look so darned cute in that photo, it's hard not to post it online for all to see. But there are privacy risks to sharing children's images, and children often don't want the exposure.

At 600,000 square miles, the sanctuary covers an area twice the size of Texas and is known as polar "Garden of Eden." This unanimous agreement is the result of years of negotiations.

Many bakers treat their sourdough starters like a family heirloom. Some starters date back decades, even centuries. Now researchers want to analyze your starters to unlock their flavor secrets.