FILE - In this April 16, 2010 file photo, steam rises from towers at an Exxon Mobil refinery in Baytown, Texas. Exxon says the energy renaissance in the U.S. will continue and predicts that North America will become a net exporter of oil and gas by the middle of the next decade. The oil and gas giant’s latest long-term energy outlook, released Tuesday, Dec. 11, 2012, says the rapid growth of production in the U.S., Canada along with improved energy efficiency will lead to more oil and gas being sent overseas. (AP Photo/Pat Sullivan. File)

Associated Press
FILE - In this April 16, 2010 file  photo, steam rises from towers at an Exxon Mobil refinery in Baytown, Texas. Exxon says the energy renaissance in the U.S. will continue and predicts that North America will become a net exporter of oil and gas by the middle of the next decade.  The oil and gas giant’s latest long-term energy outlook, released Tuesday, Dec. 11, 2012, says the rapid growth of production in the U.S., Canada along with improved energy efficiency will lead to more oil and gas being sent overseas.  (AP Photo/Pat Sullivan. File)
FILE - In this April 16, 2010 file photo, steam rises from towers at an Exxon Mobil refinery in Baytown, Texas. Exxon says the energy renaissance in the U.S. will continue and predicts that North America will become a net exporter of oil and gas by the middle of the next decade. The oil and gas giant’s latest long-term energy outlook, released Tuesday, Dec. 11, 2012, says the rapid growth of production in the U.S., Canada along with improved energy efficiency will lead to more oil and gas being sent overseas. (AP Photo/Pat Sullivan. File)
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