Carbon emissions from India are 1.9 tons per capita, for China it is 7.38 per capita and America is 15.52 tons per capita. China would be lower still if it wasn't a factory for American consumer goods.
Looking at per capita is useless when those countries have a combined population of over 2 billion (~6x US population). Climate change and the Earth doesn’t care about per capita, it only cares about the total output of carbon. The reality is that American output has most likely peaked, while China and India will keep growing for decades to come.