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CNN's John D. Sutter explores climate change and the importance of one number: 2 degrees Celsius.

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Syrian refugees and migrants along a railway line as they try to cross from Serbia into Hungary near Horgos on September 1, 2015. European Union leaders called for action to defend the "dignity" of migrants ahead of fresh emergency talks, as tensions flared on the bloc's eastern borders over the escalating crisis. AFP PHOTO / ARIS MESSINIS (Photo credit should read ARIS MESSINIS/AFP/Getty Images)

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Composed of more than 3,000 individual reefs interspersed with more than 600 topical islands, the world's most extensive coral reef system is so large it can be identified from space. While the region has been protected since 1981, a 2012 study found that the delicate ecosystem has lost more than half of its coral since 1985 due to a combination of factors including coral bleaching caused by climate change.

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QAQORTOQ, GREENLAND - JULY 30: Calved icebergs from the nearby Twin Glaciers are seen floating on the water on July 30, 2013 in Qaqortoq, Greenland. Boats are a crucial mode of transportation in the country that has few roads. As cities like Miami, New York and other vulnerable spots around the world strategize about how to respond to climate change, many Greenlanders simply do what theyve always done: adapt. 'Were used to change, said Greenlander Pilu Neilsen. 'We learn to adapt to whatever comes. If all the glaciers melt, well just get more land. (Photo by Joe Raedle/Getty Images)

2 degrees: The most important number you've never heard of

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About the author

More from CNN's John D. Sutter
John D. Sutter is an award-winning columnist for CNN Opinion and creator of the network's 2 degrees initiative. To get involved, subscribe to his newsletter or follow him on Twitter, Facebook and Instagram. Send story ideas to climate@cnn.com.