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In the lead-up to the Paris climate talks in December 2015, CNN's John Sutter led months of coverage on one number -- 2 degrees Celsius -- that is key to the planet's future. The series looked at the scientific basis for that target, which is regarded as the threshold for “dangerous” climate change and is measured as a temperature increase since the Industrial Revolution. It also explored what happens if we cross that mark and what it really will take to avoid that level of warming. http://www.cnn.com/specials/opinions/two-degrees http://www.cnn.com/interactive/2015/06/opinions/sutter-two-degrees-marshall-islands/