The iAIR single car with a compressed ai

The iAIR single car with a compressed air engine is displayed during the second press day at the Geneva car show, on March 4, 2008 in Geneva. The global auto industry, under pressure to curb emissions and grappling with plunging demand, insists it is getting serious about producing greener vehicles, ahead of the opening on March 5 of the Geneva Motor Show. The first European automobile rendez-vous of the year runs from March 5 to 15 and is expected to attract some 700,000 visitors, according to organizers. AFP PHOTO / NICHOLAS RATZENBOECK (Photo credit should read NICHOLAS RATZENBOECK/AFP via Getty Images)