Prime Minister Sunak will urge world leaders at COP 27 to move quickly in transitioning to renewable energy.
Mr Sunak changed his mind about not going to the UN climate summit in Egypt.
The importance of ending dependence on fossil fuels will be emphasized in his address on Monday.
Climate-related disasters and record temperatures were the subject of the 27th Conference of the Parties.
The prime minister will tell the leaders gathered in Sharm el-Sheikh not to backslide on their commitments to prevent global temperature rises to 1.5C above pre-industrial levels.
Mr Sunak said that when the world came together in Glasgow last year, nations agreed an historic roadmap for preventing catastrophic global warming. We need to deliver on those pledges.
Climate change is important to our future prosperity and security.
The importance of ending our dependence on fossil fuels has been reinforced by Russia's invasion of Ukraine.
The UK will be at the forefront of this global movement as a clean energy superpower if we move further and faster to transition to renewable energy.
Mr Sunak had originally said he wouldn't travel to Egypt because his priority was to plug a £50 billion hole in the public finances.
The decision was heavily criticized by climate activists, opposition parties and the president of the COP26
If the 1.5C target is to be met, the International Energy Agency says there can't be any new fossil fuel exploration in the North Sea.
Mr Sunak is expected to chair a meeting of world leaders to drive progress on the pledge signed by 100 countries at Glasgow to halt and reverse deforestation.
Buckingham Palace agreed with the former Prime Minister that the King wouldn't be going to the summit.
If Mr Sunak had been installed in No 10 earlier, they may have changed their minds.
There is an energy and cost-of-living crisis caused by President Putin's invasion of Ukraine as well as a backdrop of increasingly devastating extreme weather around the globe.
Efforts to reduce emissions, help countries deal with climate change, and secure technical support and funding for developing countries will be highlighted in the COP 27 agenda.
There is no credible pathway to meet the 1.5C goal intended to avoid the worst impacts of global warming according to the UN.
According to the UN, rich countries aren't giving enough finance to help developing nations adapt to climate change.
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