Polar Bears Resort to Cannibalism as Arctic Ice Shrinks

American and Canadian scientists reviewed three examples of polar bears preying on each other from January to April 2004, in northern Alaska and western Canada. In one incident, a bear killed a female of the species

in her den shortly after she had given birth.

Less than thirty years ago, there was 7 million square kilometers (2.5 million square miles) of ice at the end of each summer. Today’s levels are down about 40% from those numbers. A research scientist with the National Snow and Ice Data Center in Boulder, Colorado stated that “Seven million square kilometers roughly corresponds to an area of the lower 48 United States.” Imagine if, back in the early 1980s, the lower 48 states were covered in sea ice i

Some topics in this essay:
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