The promise is part of the We Are Still In campaign that Michael Bloomberg started a year ago, aiming to reassure the worldwide community that even if the federal government is against the concerted climate change tacking effort, the country still supports the Paris Agreement goals.
The Paris climate agreement is the first to unite all of the world's nations in a single accord to fight climate change. More money will come from an omnibus spending bill passed by Congress earlier this year, which allocated US$3 million to the United Nations agency.
Bloomberg, in a CBS interview, did not commit to provide funds beyond this year and said he hopes by next year Trump will have changed his mind.
Bloomberg, who has emerged as one of the leading climate campaigners in the U.S. in recent years, said the USA should continue to honour its original commitments under the Paris Agreement, regardless of the Trump administration's decision to exit the accord.
'America made a commitment and as an American if the government's not going to do it we all have responsibility. "But he should change his mind and say look there really is a problem here". America is part of the problem.
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Coming to a consensus among almost 200 countries on the need to cut greenhouse gas emissions is regarded by many observers as an achievement in itself and has been hailed as "historic". "America is a big part of the solution and we should go in and help the world stop a potential disaster".
The Paris Climate Agreement had the USA sending almost $1 billion to the Green Climate Fund which is under the U.N. Framework Convention on Climate Change.
The pact saw countries agree to limit average global warming caused by greenhouse gases from fossil fuel burning to under 2 degrees Celsius over pre-industrial levels.
Asked if he thought the nonbinding nature of the Paris deal was a problem, in terms of other countries not sticking to its aims for reducing greenhouse gas emissions and other targets aimed at reducing the effect of climate change, Bloomberg said: "Look, it's unsafe to keep doing what we're doing". That to debunk science and walk away from it is just ridiculous.
"His job is to protect the environment and he has walked away a hundred percent from that saying, 'The environment doesn't need protection".