Climate change poses a significant threat to China, especially for its teeming, economically critical coastal cities.

Publication by the UN, Red Cross says 38 heatwaves accounted for deaths of 70,000 people worldwide from 2010 to 2019.

During Xi Jinping's decade-long rule, China has built the world's largest navy, revamped the globe's biggest standing army, and amassed a nuclear and ballistic arsenal to trouble any foe.

Campaigners say it is the G20 countries that produce 80 percent of global greenhouse emissions.

Europe insists rise in coal use is only temporary and will have no long-term effect on targets to cut gas emissions.