It is now the number one among the developing countries with 6.8 tons per person, almost 3 times of India. The total volume rose by nearly 200% since 2000, and now is larger than US and Canada combined. That is why US and Canada want to include China into the mandatory reduction plan. (China only agrees the reduction on "volunteer" base without international monitoring and checking.) An international pack without China and US will be meaningless, and that is why Canada has quitted Kyoto protocol. Speaking of historical cumulative average per person, it does not make much sense. First, it is almost impossible to calculate the historical number of population; Second, under-developed countries like China have also benefited from science and technology developments and findings from the developed countries.