Former Mayor Mike Bloomberg has landed a new job as UN special envoy for climate change.

Bloomberg was assigned to boost the UN Climate Summit in 2019 and to mobilize more ambitious action to implement the 2015 Paris Climate Accord, according to Secretary-General Antonio Guterres.

Speaking at a ceremony officially appointing the billionaire businessman, Guterres said temperatures are rising faster than expected and the Arctic ice cap is “shrinking much more quickly and dramatically than in the past — so climate change is running faster than we are.”

Guterres also said Bloomberg is “convinced” the US will reach the Paris goals — despite President Trump’s decision to pull the U.S. out of the pact in 2020.

The former mayor has urged world leaders not to follow Trump.

“My hope is that President Trump listens to his advisers and looks at the data and changes his mind. And if that’s the case, that shows a great leader who when facts change, and they recognize something different, they’re not bound to what they did before, they’re willing to change,” Bloomberg said.

“And I think it’s fair to say this president does change his views — generally it’s one day to the next.”

As for the Paris Accord, countries agreed to limit global warming to 3.6 degrees Fahrenheit and do their best to keep it below 2.7 degrees Fahrenheit, compared with pre-industrial times.

But the agreement starts after 2020 — and at UN climate talks in November over 170 countries stressed the importance of implementing ambitious climate actions before then.