Boris Johnson has criticised other world leaders over their efforts to tackle climate change, telling them he is growing “increasingly frustrated” that their commitments are “nowhere near enough”.

Speaking during a meeting at the United Nations in New York, the prime minister said the gap between what has been promised by industrialised nations and what they have so far delivered remains “vast”.

Co-hosting a discussion on the issue at the UN General Assembly, Mr Johnson urged fellow leaders to renew their efforts to meet a key financing pledge to help developing nations.

The PM wants to get countries to commit to giving $100bn (£73bn) a year in support to developing nations to cut their carbon emissions and shield themselves against climate change.

But he earlier told reporters there was only a “six out of 10” chance of this target being met before the COP26 climate summit in Glasgow in November – which he then said will be “a turning point for the world” and “the moment when we have to grow up and take our responsibilities”.

He told Sky News’ political editor Beth Rigby: “We have been here before, we have all heard lots of positive noises, let’s see where we get to.

“We are not counting our chickens.”

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However, Joe Biden’s climate envoy sounded upbeat when questioned by Sky News.

“I think we’re going to get it done by COP and the US will do its part,” John Kerry said.

Asked if the US president will announce more money this week, he replied: “I’m not hoping… I’m telling you to stay tuned into the president’s speech and we’ll see where we are.”

Chairing the climate discussion on Monday, Mr Johnson noted that “everyone nods and we all agree that something must be done”.

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“Yet I confess I’m increasingly frustrated that the ‘something’ to which many of you have committed is nowhere near enough,” he continued.

“It is the biggest economies in the world that are causing the problem, while the smallest suffer the worst consequences.

“And while progress is being made all over the world, the gulf between what has been promised, what is actually being delivered, and what needs to happen… it remains vast.

“Too many major economies – some represented here today, some absent – are lagging too far behind.”

And the PM warned countries there would be consequences if the financing target is not met, saying: “If you say that the lives of their children are not worth the hassle of reducing domestic coal consumption, will they vote with you in fora such as this?

“Will they work with you, borrow from you, stand with you if you tell the world that you don’t care whether their land and their people slip below the waves?

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“To be merely a bystander is to be complicit in their fate – yet that is exactly what you will be if you fail to act this year.”

Ahead of the UN meeting, Downing Street said developed countries had “collectively failed” to meet the target.

Figures released last week by the Organisation for Economic Co-operation and Development showed that $79.6bn was mobilised in 2019, more than $20bn off the target.

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