China's emissions are the largest not because they are behind in transitioning. They are largest because they have the largest population.
It would probably be better to help the countries that have a combination of high per capita emissions and large populations that are being slow about transitioning.
For example, suppose we wanted to cut total CO2 emissions by 2.5 billion tons of CO2. There are 3 countries that could in theory cut their emissions by that amount: China, US, and India.
For China to do that, they would need to cut back to where they are similar to Spain, Italy, or Great Britain when it comes to how green their energy sources are and how much of what they do depends on emitting CO2.
For the US to cut CO2 emissions by 2.5 billion tons of CO2, we'd have to cut back to where we are where China is now on green energy and processes. That's how far the US is behind in transitioning. (Largely because the US is the only high emitting large population first world country that regularly changes its mind about whether or not there is any need to transition). (There are countries way farther behind like Qatar and Kuwait, but their populations are small enough that it doesn't really matter at this stage).
For India to cut 2.5 billion tons of CO2 they would pretty much have to stop doing anything that emits CO2 because their total emissions are just a bit over 2.5 billion tons.
It would probably be better to help the countries that have a combination of high per capita emissions and large populations that are being slow about transitioning.
For example, suppose we wanted to cut total CO2 emissions by 2.5 billion tons of CO2. There are 3 countries that could in theory cut their emissions by that amount: China, US, and India.
For China to do that, they would need to cut back to where they are similar to Spain, Italy, or Great Britain when it comes to how green their energy sources are and how much of what they do depends on emitting CO2.
For the US to cut CO2 emissions by 2.5 billion tons of CO2, we'd have to cut back to where we are where China is now on green energy and processes. That's how far the US is behind in transitioning. (Largely because the US is the only high emitting large population first world country that regularly changes its mind about whether or not there is any need to transition). (There are countries way farther behind like Qatar and Kuwait, but their populations are small enough that it doesn't really matter at this stage).
For India to cut 2.5 billion tons of CO2 they would pretty much have to stop doing anything that emits CO2 because their total emissions are just a bit over 2.5 billion tons.