Environmentalists, negotiators and activists are in southern Poland city of Katowice. They're taking part in the 24th UN Climate Change Conference, or the COP 24. Envoys from almost 200 nations and regions will show what actions they've taken since their pledges to the Paris climate accord. The meeting received a boost from last week's G20 summit – where the world's major economies reaffirmed their commitment to the landmark agreement. British filmmaker and naturalist David Attenborough attended the meeting, noting the daunting challenge climate change presents.

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