South Korea’s President Moon Jae-in said it would aim to become carbon-neutral by 2050, as the nation joined neigbours Japan in China in setting ambitious climate goals amid warnings that major policy shifts to aid renewable energy and freeze out fossil sources are needed to make the target a reality.

Moon said South Korea – which still relies on coal for more than 40% of its power generation and is still building new plants – would "replace coal power with renewables", invest in electric and hydrogen transport infrastructure and take other measures to stimulate the green economy.