World Leaders Meet In Paris To Tackle Climate Change

World leaders are meeting in Paris to try and prevent global temperatures rising to dangerous levels. 

It's the most ambitious summit on climate change ever seen – but not all countries agree on how to cut carbon dioxide levels. 

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UN Secretary General Ban Ki-Moon and Britain's Prince Charles have urged leaders to work together. 

And US President Barack Obama has painted a bleak picture of the world – if we don't act.