One of the countries that is going up (China) is also doing more than any other country to rapidly roll out renewables both domestically and in other countries, and their emissions have peaked or are near peaking, and is capable of sticking with long term plans. Also a lot of their emissions are from making things for the rest of the world.

The other country that has grown significantly in the last 20 years (India) is still far below using their fair share of the world emission budget, and they are rapidly adding renewables.

The sane way for a planet to use fossil fuels is for countries to use them to build up to the stage where they are wealthy enough to switch to renewables. If the ones that do that earlier stay on fossil fuels too long so that you get climate problems they can't just expect the countries that are not as far a long to just give up on becoming wealthy. They need to heavily subsidize those other countries in renewables so they can shorten or skip the fossil fuel bootstrap stage.

Because of the long time CO2 stays around in the atmosphere, about 40% of the CO2 currently in the atmosphere from human activity came from the US and Europe.