In this Feb. 16, 2014 satellite image provided by the NOAA Great Lakes CoastWatch is the ice cover on Lake Superior. The Army Corps of Engineers said Wednesday, March 5, 2014 that the heavy ice cover and snowfall across the Great Lakes basin should help water levels move closer to normal over the next six months. (AP Photo/NOAA Great Lakes CoastWatch)
In this Feb. 16, 2014 satellite image provided by the NOAA Great Lakes CoastWatch is the ice cover on the Great Lakes. The Army Corps of Engineers said Wednesday, March 5, 2014 that the heavy ice cover and snowfall across the Great Lakes basin should help water levels move closer to normal over the next six months. (AP Photo/NOAA Great Lakes CoastWatch)
This handout photo provided by The National Oceanic and Atmospheric Administration (NOAA) shows Arctic sea ice in 2013. The Arctic isn't nearly as bright and white as it used to be because of more ice melting in the ocean, and that's turning out to be a global problem, a new study says. With more dark, open water in the summer, less of the sun's heat is reflected back into space. So the entire Earth is absorbing more heat than expected, according to a study published Monday in the Proceedings of the National Academy of Sciences. (AP Photo/NOAA)
This image provided by NOAA compares January 13, 2013 and January 13, 2014 snow cover in Northern California and Nevada as seen by the Suomi NPP satellite. California, which is seeing its driest conditions in 500 years, is experiencing extreme drought in more than 62 percent of the state. (AP Photo/NOAA)