The US and China have agreed to an historic goal, which would see greenhouse gas emissions lowered.
President Obama promised the US would lower emissions by as much as 28% by 2025 compared with its 2005 levels.
China did not set a spacific target, but this is the first time the country, which is the world's biggest polluter set an approximate date for emissions to peak - that date being 2030.
President Obama made the announcement after talks with chinese President Xi Jinping in Beijing
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