NASA rings new global warming alarm bell; US has warmest summer since the Dust Bowl era

Two new NASA studies are raising alarm bells about global warming.

Scientists with the space agency have found that there is a decline in the amount of arctic sea ice in the winter. Their findings also show the decline is occurring at a faster rate.

Meanwhile, the National Oceanic and Atmospheric Administration said 2006 was the warmest summer in the U.S. since the Dust Bowl in the 1930s -- and the second warmest since the record keeping began in 1895.