The London 2012 fleet is bringing new carbon-cutting technology to the roads, from efficient diesel, hybrid and electric cars but can these technologies leave their own Olympic legacy.
In a visit to the Olympic Park on the eve of the London 2012 Opening Ceremony, UNEP Executive Director, Achim Steiner, gives the event the thumbs up for sustainability.
RTCC takes a look at some of the innovative ideas which have gone into making the 2012 Games arenas some of the most sustainable ever seen at an Olympic event.