Planet Earth

Yesterday, at exactly 4:44 p.m., the first day of the fall season began. We know what that means: pumpkin lattes, the crunch of leaves beneath your boots and brisk weather. But...

Scientists working on a landmark U.N. report on climate change are struggling to explain why global warming appears to have slowed down in the past 15 years even though...

Earth could continue to host life for at least another 1.75 billion years, as long as nuclear holocaust, an errant asteroid or some other disaster doesn't intervene, a new...

The world has warmed 0.09 degrees Fahrenheit per decade over the past 15 years, a fraction of the 0.36ºF per decade rate confidently predicted by the U.N. six years ago,...

North America's tallest peak just got shorter.