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That has been achieved largely by outsourcing heavy manufacturing that requires a lot of cheap energy to China.

China one of the highest carbon emission rates per GDP of any large developed nation, but China can't exclusively be blamed for that. China is the "workshop of the world." It's where other countries send their polluting industries to get that pollution out of sight and out of mind, as well as to exploit cheaper labor and a high concentration of manufacturing expertise. China is blasting out CO2 to manufacture products that are exported back to the US, Canada, Europe, and so on, making the latter's carbon emissions look better than they actually are.

I'm not saying China couldn't be cleaner, just that the economy is global and so is this problem. If China switched to cleaner but more expensive energy and took other steps to reduce CO2 emissions, their costs would go up. This would just push manufacturing to whatever countries are willing to ignore climate change.