Daniel Yergin, co-founder and chairman of Cambridge Energy Research Associates, listens to a question during the Reuters Energy Summit in Washington June 1, 2009. Reuters Pictures 5 months ago

Daniel Yergin, co-founder and chairman of Cambridge Energy Research Associates, listens to a question during the Reuters Energy Summit in Washington June 1, 2009.

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  1. MCLEAN, VA - NOVEMBER 27: Black Friday shoppers get an early start on their holiday gift-buying at Tyson's Corner Center on November 27, 2009 in McLean, Virginia. The National Retail Federation estimates that up to 134 million people will shop this Friday, Saturday or Sunday.
  2. MCLEAN, VA - NOVEMBER 27: The sign outside of Tyson's Corner Center entices holiday shoppers to get an early start on their Black Friday gift-buying on November 27, 2009 in McLean, Virginia. The National Retail Federation estimates that up to 134 million people will shop this Friday, Saturday or Sunday.
  3. MCLEAN, VA - NOVEMBER 27: A Black Friday shopper get an early start on his holiday gift-buying at Tyson's Corner Center on November 27, 2009 in McLean, Virginia. The National Retail Federation estimates that up to 134 million people will shop this Friday, Saturday or Sunday.
  4. MCLEAN, VA - NOVEMBER 27: Hannah Craig of Memphis, Tennessee (L) and Jeni Brown of Haymarket, Virginia, get an early start on their holiday gift-buying at Tyson's Corner Center on November 27, 2009 in McLean, Virginia. The National Retail Federation estimates that up to 134 million people will shop this Friday, Saturday or Sunday.
  5. MCLEAN, VA - NOVEMBER 27: Black Friday shoppers get an early start on their holiday gift-buying at Tyson's Corner Center on November 27, 2009 in McLean, Virginia. The National Retail Federation estimates that up to 134 million people will shop this Friday, Saturday or Sunday.
  6. EASTLEIGH, UNITED KINGDOM - NOVEMBER 27: New Portsmouth FC Manager Avram Grant with C.E.O. Peter Storrie attends a Press Conference at their training ground on November 27, 2009 in Eastleigh, England.
  7. Traders wait for customers as evening dawns, a day ahead of Eid al-Adha in New Delhi, India, Friday, Nov. 27, 2009. Eid al-Adha, or "festival of the sacrifice," commemorates the Prophet Abraham's willingness to sacrifice his son Ishmael at God's command.
  8. A customer drags a goat after buying it, a day ahead of Eid al-Adha in New Delhi, India, Friday, Nov. 27, 2009. Eid al-Adha, or "festival of the sacrifice," commemorates the Prophet Abraham's willingness to sacrifice his son Ishmael at God's command.
  9. A trader waits for customers as evening dawns a day ahead of Eid al-Adha in New Delhi, India, Friday, Nov. 27, 2009. Eid al-Adha, or "festival of the sacrifice," commemorates the Prophet Abraham's willingness to sacrifice his son Ishmael at God's command.
  10. People buy and sell goats, a day ahead of Eid al-Adha in New Delhi, India, Friday, Nov. 27, 2009. Eid al-Adha, or "festival of the sacrifice," commemorates the Prophet Abraham's willingness to sacrifice his son Ishmael at God's command.
  11. Traders wait for customers as evening dawns, a day ahead of Eid al-Adha in New Delhi, India, Friday, Nov. 27, 2009. Eid al-Adha, or "festival of the sacrifice," commemorates the Prophet Abraham's willingness to sacrifice his son Ishmael at God's command.
  12. Customers look at the teeth of a goat to ascertain its age, a day ahead of Eid al-Adha in New Delhi, India, Friday, Nov. 27, 2009. Eid al-Adha, or "festival of the sacrifice," commemorates the Prophet Abraham's willingness to sacrifice his son Ishmael at God's command.
  13. Trinidad and Tobago's Prime Minister Patrick Manning (L) welcomes Malaysian Prime Minister Najib Razak at the National Academy for the Performing Arts to the opening ceremony of the Commonwealth Heads of Governemnt Meeting in Port-Of-Spain, November 27, 2009.
  14. American university student Amanda Knox's mother Edda Mellas and her stepfather Chris Mellas walk at the end of the morning session of a murder trial session in Perugia November 27, 2009. Defendants Amanda Knox and Raffaele Sollecito are on trial for the murder of British student Meredith Kercher in November 2007.
  15. People look at a monument named "I Love Money", which is the official symbol of the Banking Institute University, in Prague November 27, 2009. The chancellor of the university dedicated the monument to the students who initiated the Velvet Revolution 20 years ago that eventually saw the overthrow of the Communist government.
  16. The sun rises over a mosque in Cairo on the first day of Eid al-Adha, November 27, 2009. Muslims around the world celebrate Eid al-Adha to mark the end of the haj by slaughtering sheep, goats, cows and camels to commemorate Prophet Abraham's willingness to sacrifice his son Ismail on God's command.