A spirited bunch run into the Chesapeake Bay during the 16th annual Maryland State Police Polar Bear Plunge.
After recovering last year, the water level of Lake Mead - the country's largest man-made reservoir - is dropping once again.
Scientists feel we can fix the problem of ocean acidification but it might cost trillions a year and do more harm than good.
After a very wet winter, California declares its three-year drought emergency over, but long-term water challenges remain.
Following an error-riddled report last week that climate change may profoundly alter the global food supply in just nine years, an expert weighs in on the real risks.