The Texas Gulf coast is among the most dynamic environments on Earth. Jeffrey Paine talks about the retreating coastline, and the risks and value of human activity there.
Scientists developed a computer model to identify four possible instances of true polar wander in the past. And, they say, true polar wander is happening now.
2012 was the ninth warmest year in the 132-year record. The ten warmest years have all occurred since 1998. The last cooler-than-average year was 1976.