Dust clouds are building high over the Atlantic. An entire population of caribou is declining, while other species are pushed to the limits of their physical survival in the oceans. A respiratory illness, once uncommon among children in Trinidad, is now widespread. From the Arctic north to the tropical isles of the Caribbean, scientists are documenting a series of perplexing phenomena many believe is linked to global climate change. Join actor Edward Norton to uncover the dramatic effects of a one-degree global temperature rise.