This argument is crap. The author is just looking for a way to make China more culpable than they are. That is a very popular past time for many people right now. Most of China's emissions are in the creation of crap for the west anyway.
The only truly fair metric is estimated CO2e per capita emissions since the dawn of the industrial revolution. This makes Great Britain the number one polluter. The reason this is the only fair metric is that developed countries have their economic foundations built upon prior CO2e emissions. To deny other countries this same opportunity is grossly unfair. Since the equivalent emissions of CO2e from developing countries would be catastrophic for everyone the developed world (US, Canada, Australia, Japan, Western Europe, the U.K.) needs to go carbon neutral immediately and then pay for the majority of the expenses to make the rest of the world carbon neutral. The developing countries get to emit all the CO2 they want until the above countries are carbon neutral
I'd have to double check this but I believe in current per capita emissions Australia is the number one CO2e emitter, not the U.S.
John Thornton