The US has begun the process of withdrawing from the Paris Agreement, notifying the UN of its intention to leave, as other countries expressed regret and disappointment at the move.
The notification begins a one-year process of exiting the global climate change accord, culminating the day after the 2020 US election.
The agreement brought together 188 nations to combat climate change.
France and Japan have led international condemnation of the move.
It committed the US and 187 other countries to keeping rising global temperatures below 2C above pre-industrial levels and attempting to limit them even more, to a 1.5C rise.
The decision to withdraw – taken by President Donald Trump – made the US the world’s sole non-signatory and prompted high-level efforts by the European Union to keep the agreement on track.
However, hundreds of local governments, businesses and organisations in the US have joined the We Are Still In movement, pledging to cut emissions and move to renewable energy.
UN climate envoy and US entrepreneur Michael Bloomberg said in a statement posted on the movement’s website that he was working to fill the funding gap left by the Trump administration’s withdrawal, which he described as an “abdication of leadership”.