In an address at the World Leaders Summit opening ceremony on Monday, the Prime Minister will urge world leaders to take concrete steps on phasing out coal, accelerating the transition to electric vehicles, and halting deforestation as well as supporting developing nations on the frontline of the climate crisis with climate finance.

These actions will make the biggest difference in reducing emissions this decade on the world's path to net zero and keeping alive the global aim of limiting rising temperatures to 1.5C under the Paris Agreement.

Leading by example, the UK doubled its International Climate Finance commitment to 11.6 billion pounds over five years in 2019, and the Prime Minister's new announcement would take this to a world-leading 12.6 billion pounds, if the economy grows as forecast.

The UK's International Climate Finance is drawn from the overseas aid budget, which -- as set out in the Spending Review -- is forecast to return to 0.7 per cent of GNI in 2024-25. The funding goes to life-changing programmes around the world, shoring up the defences of communities on the frontline of climate change, protecting nature and biodiversity, and supporting the global transition to clean and green energy.

At Monday's opening ceremony, Johnson is expected to say: "Humanity has long since run down the clock on climate change. It's one minute to midnight and we need to act now. If we don't get serious about climate change today, it will be too late for our children to do so tomorrow."

Later in the day, he will bring round one table some of the world's biggest economies with the countries most vulnerable to climate change to hear what is at stake for countries if action is not taken now and set the tone for two weeks of negotiations to come.

The COP26 climate summit comes six years after the Paris Agreement was signed by over 190 countries to limit rising global temperatures to well below 2C with a view of reaching 1.5C.

According to the UN, global temperatures are currently set to rise to 2.7C.

Scientists are clear that emissions must halve by 2030 to keep the aims made in Paris within reach.