A limited number of countries are responsible for the huge gap between where we need to go and what we’re actually doing. Nearly two-thirds of 2023’s emissions come from just six countries: China, the US, India, the EU, Russia, and Brazil. By contrast, the 55 nations of the African Union are only producing about 6 percent of the global emissions. Obviously, this means that any actions taken by these six entities will have a disproportionate effect on future emissions. The good news is that at least two of those, the EU and US, saw emissions drop over the year prior (by 7.5 percent in the EU, and 1.4 percent in the US), while Brazil remained largely unchanged.

Source: With four more years like 2023, carbon emissions will blow past 1.5C limit - Ars Technica