The agreement signed by 181 countries in 2009 to sharply limit CO₂ emissions was the:

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The agreement referred to is the Copenhagen Accord, which was an outcome of the 15th Conference of the Parties (COP 15) to the United Nations Framework Convention on Climate Change held in Copenhagen in 2009. While not all countries formally signed onto the Accord, it was acknowledged by many and aimed to limit global warming.

The Agreement Signed by 181 Countries in 2009 to Sharply