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Last year "marked the warmest year on record for the contiguous United States," the National Climatic Data Center just confirmed.

Years of drought and water supply shortages have led to permanent water restrictions in the city of San Diego.

Land that isn't in good enough condition to grow crops could be used to produce substantial amounts of liquid biofuels, a new study claims. But there are many concerns about the study, and about the future of advanced biofuels in the U.S. and abroad.

Millions of acres of marginal farmland in the Midwest -- land that isn't in good enough condition to grow crops -- could be used to produce liquid fuels made from plant material, according to a study in Nature. And those biofuels could, in theory, provide about 25 percent of the advanced biofuels required by a 2007 federal law.

It's a good thing Punxsutawney Phil's handler admitted he'd misinterpreted the early spring forecast from the world-famous groundhog weather prognosticator. The National Weather Service issued a winter storm warning Wednesday for parts of Colorado. It says the heavy snow that has blanketed swaths of the Rocky Mountains is moving east:

San Diego farmers are facing a triple threat: rainfall is three inches below average, water prices have skyrocketed, and the state’s snowpack is 52 percent of normal.

Populations of frogs, salamanders and other amphibians are declining at an average rate of 3.7 percent each year, according to a U.S. Geological Survey study released this week. Researchers say the study is the first to calculate how quickly amphibians are disappearing in the United States.

Trout fishing is a magnet that draws people from around the world to places like Ovando, Mont. Just ask the owner of Blackfoot Angler and Supplies, Kathy Schoendoerfer.

Firefighters were chasing early-morning flare-ups Friday in a damaging wildfire that was largely tamed but kept thousands of people from their homes in the foothill suburbs northeast of Los Angeles.

With 15,000 firefighters deployed and three dozen major wildfires currently burning in five Western states, this would seem to be a wildfire season for the record books. And in one tragic aspect, it is. But by most measures, 2013 is the second-mildest fire season in the past decade ... so far.