Furor has mounted in the U.S. and U.K. over the hero's welcome given by Libya to Abdelbaset al-Megrahi, who is dying of cancer, with politicians on both sides of the Atlantic calling for an investigation into whether al-Megrahi's release was a condition of oil exploration contracts signed by Britain's BP in 2007.

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In 2007, the Ecuadorian government made an offer that the oil would not be extracted on the condition that developed nations compensated them half of the money that the country would have earned through extracting the oil.

CNN: Uncovering Ecuador's biodiversity jewel

Another key issue during Mr Calderon's term has been the condition of the state oil company Pemex.

BBC: Felipe Calderon in December 2010