Exxon Mobil CEO Rex Tillerson said on Thursday it would be difficult to meet President-elect Barack Obama's goal to significantly boost U.S. alternative energy production.
In a speech at George Mason University in Fairfax, Virginia, Obama said he wanted the United States to double its output of alternative energy sources during the next three years as part of his plan to revive the American economy.
"I think that's going to be very challenging to do," Tillerson told reporters following a speech at the Woodrow Wilson Center in Washington.
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