GENEVE, SWITZERLAND - MARCH 31: Billy Glover, Managing Director, Environmental Strategy Boeing Commercial Airplanes, speaks during the Aviation and Environment 2009 Summit at the Crown Plaza on March 31, 2009 in Geneve, Switzerland. The Conference discussed ideas for improvements on fuel efficiency and alternatives fuels such as biofuels. Getty Images logo Getty Images 35 months ago

GENEVE, SWITZERLAND - MARCH 31: Billy Glover, Managing Director, Environmental Strategy Boeing Commercial Airplanes, speaks during the Aviation and Environment 2009 Summit at the Crown Plaza on March 31, 2009 in Geneve, Switzerland. The Conference discussed ideas for improvements on fuel efficiency and alternatives fuels such as biofuels.