Costello: Climate change isn't a debate

An iceberg that broke off from the Jakobshavn Glacier floats through the water on July 21, 2013 in Ilulissat, Greenland. As the sea levels around the globe rise, researchers affilitated with the National Science Foundation and other organizations are studying the phenomena of the melting glaciers and its long-term ramifications. The warmer temperatures that have had an effect on the glaciers in Greenland also have altered the ways in which the local populace farm, fish, hunt and even travel across land. In recent years, sea level rise in places such as Miami Beach has led to increased street flooding and prompted leaders such as New York City Mayor Michael Bloomberg to propose a $19.5 billion plan to boost the citys capacity to withstand future extreme weather events by, among other things, devising mechanisms to withstand flooding.

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    Costello: Climate change isn't a debate

CNN's Carol Costello questions why the public is unsure whether or not climate change is real.