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Environment ministers and government officials from around the world are gathering in Mexico to talk about climate change, and how to tackle the problem of increasing greenhouse gas emissions.
Didn’t they do that last year?
Last year’s climate summit in Copenhagen produced a deal by which both developed and developing countries for the first time agreed to curbs on their greenhouse gas emissions, but that was not a full treaty.
Will a treaty be signed this year?
No – the Cancun meeting is a staging post on the way to a bigger meeting in South Africa next year, at which the United Nations is hoping a new pact will be signed.