U.S. President Barack Obama greets workers as he visits Opower, a smart grid and energy efficiency software company in Arlington

 
U.S. President Barack Obama greets workers as he visits Opower, a smart grid and energy efficiency software company in Arlington
U.S. President Barack Obama greets workers as he visits Opower, a smart grid and energy efficiency software company in Arlington, March 5, 2010. Obama spoke about clean energy jobs during his visit to the company. REUTERS/Jason Reed (UNITED STATES - Tags: POLITICS ENERGY SCI TECH EMPLOYMENT BUSINESS)