In a year full of troubling signs that Earth’s climate is rapidly changingspingold, some of the most alarming signals came from the Arctic. The thawing tundra has become a source of greenhouse gas emissions, instead of locking away carbon. Sea ice l...

Every December, more than 25,000 scientists from around the globe descend upon a cavernous convention center to eat dry sandwiches, drink weak coffee and ponder all things Earth and climate and space. This is the annual meeting of the American Geoph...