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DENALI NATIONAL PARK, AK - SEPTEMBER 1: A view of Denali, formerly known as Mt. McKinley, on September 1, 2015 in Denali National Park, Alaska. According to the National Park Service, the summit elevation of Denali is 20,320 feet and is the highest mountain peak in North America. (Photo by Lance King/Getty Images)
DENALI NATIONAL PARK, AK - SEPTEMBER 1: A view of Denali, formerly known as Mt. McKinley, on September 1, 2015 in Denali National Park, Alaska. According to the National Park Service, the summit elevation of Denali is 20,320 feet and is the highest mountain peak in North America. (Photo by Lance King/Getty Images)

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Why agree to a climate change deal?

The answer, from the UN climate chief, may surprise you. Saving the planet is important, but she say's there's a much more powerful force at work.