You seem to be a bit confused about what the peak is. The US peaked at around 22.7 tons per capita. China is currently at about 8 tons per capita, and that looks like it will be the peak as they start falling from next year. The timing may vary a bit, but they certainly are not going to reach 22.7 tons per capita.
By the way, while the US has been falling, it's still at about 14.5 tons per capital, i.e. still nearly twice the average Chinese person. The EU27 is at 7.25 tons, and enjoys a lifestyle comparable or better than the US, so cue the other excuses like "the US is bigger, we have to commute further, we need more air conditioning" etc.
Sorry if this comes off as harsh, but it's just an undeniable fact that the US is emitting a lot of CO2 per person.