Although causes of global warming are still argued, driven by natural forces or human interference, global warming is an evident fact now. And the second obvious thing is the immense growth of CO2 emissions, which increased x1000 times during 1753-2008 period (from 8 mln. metric tones of carbon to 8.7 billion metric tones).
Nowadays China and United States are responsible for almost 40% of global CO2 emissions. But the great difference between them consists in per capita CO2 emissions. While in US this indicator has been stable at 5 metric tones per person since the beginning of 80th, per capita CO2 emissions in China are relatively low - at 1.4 metric tones. And this is a general distinction between developed and developing world. It means that during many decades ahead, growing wealth in developed world will cause the increase of global greenhouse gas emissions.
Global CO2 emissions and climate change World CO2 emissions by process