"Russia's invasion of Ukraine and contemptible manipulation of energy prices has only reinforced the importance of ending our dependence on fossil fuels," Sunak said in a statement issued by his office.
"We need to move further and faster to transition to renewable energy, and I will ensure the UK is at the forefront of this global movement."
Britain hosted last year's COP26 summit in Glasgow and Sunak will urge leaders to stick to promises they made then. He will hold meetings on energy security, green technology and environmental protection, as well as chairing a discussion on forests and nature.