CNN Opinion columnist John D. Sutter is reporting on a tiny number -- 2 degrees -- that may have a huge effect on the future. He'd like your help. Tell him how you fear climate change could affect you personally, and you could be part of CNN's coverage.
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Maubeuge, France (CNN)Four months and 1,300 miles ago, Erlend Moster Knudsen started running. Starting line: Arctic Norway. Destination: a U.N. climate change summit in Paris.