"Mr. Bloomberg informed the Secretary-General [UN Secretary-General Antonio Guterres] in a letter on 11 November that he was stepping down, resigning from his role as a UN Climate envoy", Dujarric said. "So, as of 11 November, he was no longer the UN envoy".
On Sunday, Bloomberg announced that he had joined the 2020 US presidential race, saying that ''he is running to defeat Donald Trump".
In April last year, Guterres appointed Bloomberg as his special envoy for Climate Action.
Bloomberg was mayor of New York City from 2002 to 2013 and is the founder of Bloomberg News outlet. His net worth is estimated at well over $50 billion.