Then again, the US having a much higher emissions per capita assumes that with comparatively much less effort, we can reduce our emission than India or China. For us, reducing our emissions by 10% would mean driving less, eat less beef, investing in new technologies, etc., while for India and China that would mean overturning years of industrialization.

While I do agree that both need to reduce emissions, we need to endure inconveniences and move our tax dollars to clean energy, while they have to continue being poor forever or spend inordinate amounts of money to industrialize using clean energy.

The atmosphere also doesn't care which governments are involved, or who is "leading". We need all the emissions to stop, this announcement is about 7.5% of the total which is quite significant. 12 more of those and we're done.

Per capita emissions are a good indicator of the lifestyle of a country.

Total country emissions are an indicator of population and lifestyle. Since reducing the population is not an option for most countries, the solution is changing lifestyle.