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Climate change is being felt in the Far Narth first ,and most dramatically , because of what scientists call ”feedback processes .” As the 　　　region`s abundant snow and ice melt away , increased areas of water 　and exposed to the sun. Those darker surfaces absorb much higher 　　amounts of 　　solar radiation; as they expand in size, the darker 　　surfaces take in more heat, which accelerates the warming . “　　　Basically the warming builds on 　　　itself,”says Weller. “It has a 　magnified effect.”
Globally over the past century, the average annual temperature has　　　 increased about 1 degree Centigrade ; in the Arctic, it has climbed 2 　to 3 degrees C (3.5 to 5 degrees Fahrenheit ).” That may not seem 　　like much ,but it’s a huge signal of change ,”Wintertime changes　 have been even greater, ranging from 7 to 9 degrees F higher in some　 parts of the Arctic between 1954 and 2004.