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Climate change: US formally withdraws from Paris agreement

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After a three-year delay, the US has become the first nation in the world to formally withdraw from the Paris climate agreement.President Trump announced the move in June 2017, but UN regulations meant that his decision only takes effect today, the day after the US election.The US could re-join it in future, should a president choose to do so.The Paris deal was drafted in 2015 to strengthen the global response to the threat of climate change.It aims to keep the global temperature rise this century well below 2C above pre-industrial levels and to pursue efforts to limit the temperature increase even further to 1.5C.

The delay is down to the complex rules that were built into the Paris agreement to cope with the possibility that a future US president might decide to withdraw the country from the deal. Even though the agreement was signed in December 2015, the treaty only came into force on 4 November 2016 , 30 days after at least 55 countries representing 55% of global emissions had ratified it.No country could give notice to leave the agreement until three years had passed from the date of ratification.Even then, a member state still had to serve a 12-month notice period on the UN.

So, despite President Trump’s White House announcement in June 2017 , the US was only able to formally give notice to the UN in November last year. The time has elapsed and the US is now out.

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