More than 30,000 people traveled to the UN's COP21 climate summit in Paris last month from aroudn the world. The UN set up a website where attendees could offset the carbon footprint of their travel.

More than 30,000 people traveled to the UN's COP21 climate summit in Paris last month from aroudn the world. The UN set up a website where attendees could offset the carbon footprint of their travel.

Credit:

Mal Langsdon

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