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Paris 2015
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COP21: Key leaders acting on climate change

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COP21: Key leaders acting on climate change

Over the last two weeks, the world's politicians, businessmen, scientists and environmentalists have gathered in Paris to discuss one thing: how to save the world from the catastrophic effects of climate change.

Practically everyone has weighed in at the U.N. Climate Change Conference, known as COP21, expressing what they think needs to be done to secure a cleaner future.

CNBC takes a look at some of the powerful comments.

—By CNBC's Alexandra Gibbs

Martin Bureau | AFP | Getty Images