According to the study co-authored by a former Obama admin climate policy official, energy modelers and emissions experts (just go with it), China is now responsible for 27% of total global emissions - more than the combined total produced by the United States (11%), India (6.6%) and the 27 EU member nations together (6.4%).
In 2019, China's emissions not only eclipsed that of the US—the world's second-largest emitter at 11% of the global total—but also, for the first time, surpassed the emissions of all developed countries combined (Figure 2). When added together, GHG emissions from all members of the Organization for Economic Cooperation and Development (OECD), as well as all 27 EU member states, reached 14,057 MMt CO2e in 2019, about 36 MMt CO2e short of China's total. -Rhodium Group
In short, Chinese President Xi Jinping stole Greta Thunberg's childhood.
That said, the Rhodium Group also gives China somewhat of a pass for their climate sins - noting that since it's home to over 1.4 billion people, they're not quite so evil per capita.
To date, China's size has meant that its per capita emissions have remained considerably lower than those in the developed world. In 2019, China's per capita emissions reached 10.1 tons, nearly tripling over the past two decades (Figure 3). This comes in just below average levels across the OECD bloc (10.5 tons/capita) in 2019, but still significantly lower than the US, which has the highest per capita emissions in the world at 17.6 tons/capita. While final global data for 2020 is not yet available, we expect China's per capita emissions exceeded the OECD average in 2020, as China's net GHG emissions grew around 1.7% while emissions from almost all other nations declined sharply in the wake of the COVID-19 pandemic.