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Image credits
Image Credits:

Photos: smokestack, © Ken W. Kiser; polar bears, courtesy of US Department of the Interior; sky, © Vanessa Van Ryzin; ice, © USGS; traffic light, courtesy of istockphoto.com; traffic, © Tony Tremblay; buoy, © NOAA; scientists and ice core, © AMNH; flood, © USGS; Arctic ice cover, © NASA; coral reefs, © Ian Skipworh; periwinkle snail, © USGS; girl with bag, © AMNH; house with solar panels, © Taggart Construction.