The U.S. still beats China in movie box office revenue, number of Internet users and spending on the military. But China has leaped ahead in spewing carbon emissions into the atmosphere. That is quite a dramatic feat, given the amount of CO2 generated by the USA. Still, Americans are far more productive than the Chinese in this arena. With a mere 5 percent of the planet's population, we consume 20 percent of global energy and it is the consumption of all that energy -- largely produced from fossil fuels -- that unleashes all that extra carbon.