Why climate was the story of 2015

(CNN)CNN's John Sutter is an award-winning columnist who made climate change his focus in 2015 with the creation of the network's "2 degrees" project. He asked viewers and readers what climate-related topics they wanted him to cover -- and then he traveled the globe to deliver eye-opening stories. His work culminated in December's climate change summit COP21 in Paris.

People living on the front lines of climate change -- from Uganda, Marshall Islands, Alaska, Colorado, Peru, Iran -- share their stories with CNN's John Sutter, who then makes a case for stopping climate change, on their behalf.
    CNN's John Sutter visits Denmark, exploring how this country is on track to completely ditch fossil fuels by 2050. He argues the rest of the world needs to adopt the country's zeal for renewable energy technologies and introduce policies that put a price on carbon pollution.
    If the world is going to meet the 2 degrees goal for climate change, the United States must leave 95% of existing U.S. coal reserves unburned and in the ground. CNN's John Sutter visits the Northern Cheyenne Reservation in Montana, which is an island of prairie in a sea of coal mining. It's part of the Powder River Basin, which produces 40% of U.S. coal. But this reservation has stood up to development, at a cost.
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    It's one of the clearest injustices of climate change: The Marshall Islands likely won't exist if we warm the planet 2 degrees. CNN's John Sutter traveled to the remote Pacific to learn what it's like to try to process that doomsday forecast -- and why some people already are making the painful decision to leave.
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    What will it really take to stop global warming short of 2 degrees Celsius? CNN and Climate Central partner to create an online quiz to let readers figure out how they can help meet this goal -- and avoid disaster.