The fight against climate change can become “a global mission for new jobs and clean growth”, Rishi Sunak will tell world leaders at the COP27 summit.
The prime minister will also say it is essential nations stick to commitments made at COP26 in Glasgow a year ago.
The UN’s climate change chief said a key aim to limit global temperature rises is “still within reach”.
Sunak is making his first outing on the international stage in Egypt after becoming UK PM last month.
Sunak will unveil more than £200m in funding to protect forests and for green technologies in developing nations.
He reversed a decision not to attend COP27 earlier this week after a backlash from opposition MPs and campaigners. He initially declined the invite as he said he was too busy preparing the November budget.
In his opening address on Monday, Sunak will urge global leaders to “move further and faster” to avoid the worst impact of climate change by limiting global warming to 1.5C above pre-industrial levels.
He will say Russia’s invasion of Ukraine has “reinforced” the importance of ending dependence on fossil fuels, but will argue the move can give a boost to new green industries.
“The world came together in Glasgow with one last chance to create a plan that would limit global temperature rises to 1.5C. The question today is: can we summon the collective will to deliver on those promises?” he will say.
“By honoring the pledges we made in Glasgow, we can turn our struggle against climate change into a global mission for new jobs and clean growth. And we can bequeath our children a greener planet and a more prosperous future.”
Sunak will also meet French President Macron at the conference, where the topic of migrants crossing the English Channel in small boats is likely to be raised. The prime minister has said reducing the number of crossings is a “key priority”.