Though summer melting is a yearly occurrence in the Arctic sea, this year set a new benchmark: Three-fourths of the ice melted away. Scientists say the effects of this unprecedented melting are likely to result in extreme weather changes throughout the Northern Hemisphere.
Melissa Block talks to Jack Crayon, an environmental scientist at California's Department of Fish and Game, about odd smells that have invaded a large area in Southern California. He says it smells like the gases from the Salton Sea.
More sea ice in the Arctic Ocean melted in the summer of 2012 than at any time since scientists began tracking the phenomenon. NPR science correspondent Richard Harris discusses how the historic loss of ice cover could affect weather conditions around the world.
Emerging science shows that people respond more favorably to warnings about climate change when it's portrayed as a health issue rather than as an environmental problem. Should the symbol for danger be a child instead of a polar bear?
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