FILE -In this Tuesday, March 6, 2012, file photo taken with a long exposure, a pumping unit sucks oil from the ground near Greensburg, Kan. The United States will become the world's largest oil producer by around 2020, temporarily overtaking Saudi Arabia, as new exploration technologies help find more resources, the International Energy Agency forecast on Monday, Nov. 12, 2012. (AP Photo/Charlie Riedel, File)

Associated Press
FILE -In this Tuesday, March 6, 2012, file photo taken with a long exposure, a pumping unit sucks oil from the ground near Greensburg, Kan. The United States will become the world's largest oil producer by around 2020, temporarily overtaking Saudi Arabia, as new exploration technologies help find more resources, the International Energy Agency forecast on Monday, Nov. 12, 2012. (AP Photo/Charlie Riedel, File)
FILE -In this Tuesday, March 6, 2012, file photo taken with a long exposure, a pumping unit sucks oil from the ground near Greensburg, Kan. The United States will become the world's largest oil producer by around 2020, temporarily overtaking Saudi Arabia, as new exploration technologies help find more resources, the International Energy Agency forecast on Monday, Nov. 12, 2012. (AP Photo/Charlie Riedel, File)
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