Realistically, there is little incentive for China to cut back on coal usage. In an ideal world China would use the funds directed to Belt and Road to green infrastructure but in terms of its own ambition and growth prospects coal is the only reliable energy source to match the scale of China's ambition.

The global economy needs China to keep on growing. Germany, arguably the most important economy in the world outside of China, India and the US is nearing recessions because of slowing Chinese consumer spending. A recession in the EU spells disaster for the rest of the world.

It's difficult to expect China to curb it's growth for the common good when more advanced economies ignored the science for decades (ie. at least since the 70S) to favor its own growth.