We cam across this tool by Google which presents data on carbon emissions from different countries.
Click here to view UK, USA, China and North Korea.
You can select other countries using the left hand menu. These figures are per person in the population which is a more useful comparison. To view the total carbon by country click here.
The big drop in North Korea's carbon emissions was caused by the famine in 1997 when most of the electricity supply was switched off.
It makes interesting reading.