Geneva car show: green machines

A man walks in front of a CO2 installation during the press day at the 79th Geneva International Motor Show in Geneva, Switzerland Photograph: Sandro Campardo/AP

The Opel Ampera an 'extended range electric vehicle’ – E-REV – will be sold mass-market from 2011 Photograph: Nicholas Ratzenboeck/AFP/Getty Images

A cleaner wipes the new Volvo S80 at the booth of the Swedish carmaker during the first media day of the 79th Geneva Car Show on March 3, 2009 in Geneva. Photograph: Fabrice Coffrini/AFP/Getty Images

Governor of California, Arnold Schwarzenegger, centre, talks to VW's head of development, Ulrich Hackenberg, right, next to the new Polo Blue Motion Photograph: Anja Niedringhaus/AP

Citroen DS Inside concept: the French carmaker plans to make smaller, more efficient, but slower cars Photograph: PR

A Bentley Continental Supersports car is displayed during the first media day of the 79th Geneva Car Show at the Palexpo in Geneva March 3, 2009. Photograph: Arnd Wiegmann/REUTERS

Seat's Leon Ecomotive concept car Photograph: Uli Deck/EPA

Frazer-Nash uses hybrid technology for the Namir Giugiaro Photograph: www.autobloggreen.com

The new Brabus Electric Drive Smart car Photograph: Denis Balibouse/Reuters

The new Toyota Prius Photograph: Nicholas Ratzenboeck/AFP/Getty Images

The new EDAG Light Car Photograph: Martial Trezzini/AP

Renault Electric Concept Car ZE Photograph: Sandro Campardo/EPA

The Concept Electric Car Mila EV by Magna Steyr Photograph: Sandro Campardo/AP