Emissions of carbon dioxide across the globe continue to soar despite the many concerns over the longterm effects this will have to our planet. The explosive increase in China's output over the last decade has pushed it's levels above those of the United States. However it still has some way to go before it becomes the most polluting nation per capita, a position currently being held by Saudi Arabia with the USA and Australia not far behind. It's also interesting to compare the amount of GDP for every metric ton of released to see who is the most efficient user of carbon-based fuels.