The 10 largest energy companies in the world are all oil and gas concerns. They also help us draw a map of global power: Three are American, three are Russian, two are Chinese, one is French, and one is British.

This is according to the annual Platts Top 250 list, which ranks the world's energy businesses.

It's worth noticing the scale of these companies. All generate more than $100 billion per year in revenue. Google had revenue of $8.4 billion in 2010. Microsoft generated $62.5 billion in the same year.