Former New York Mayor Michael Bloomberg says he will pay $4.5m (£3.2m) to cover the lapsed US financial commitment to the Paris climate accord.
He said he had a responsibility to help improve the environment because of President Donald Trump’s decision to pull out of the deal.
The withdrawal was announced last June and sparked international condemnation.
It will make the US in effect the only country not to be part of the Paris accord.
The Paris agreement commits the US and 187 other countries to keeping rising global temperatures “well below” 2C above pre-industrial levels.
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