London's bid for the 2012 Olympic Games came with a hefty vow: to host the greenest Olympics in the tournament's recent history. That vow is being kept through a variety of energy-efficient features at this year's summer games, writes Alliance to Save Energy.

Although London's commitment to sustainability was questioned after it ditched plans for a wind turbine and other eco-friendly facets, organizers assure Olympic-goers that the 2012 games will be a green experience like no other.

With Olympic Park's many energy-saving products and practices, the area's permanent structures emit 58 fewer fewer carbon emissions than if they had been built to the UK's 2006 building standards.

Sustainability won't stop once the games end in August. For instance, the velodrome - the most energy-efficient venue - and a separate aquatics center will be "recycled" as facilities for the local community.