Denis Doyle

Travel

MADRID, SPAIN - JUNE 22: A woman visits the Tongji university of China bamboo solar-powered house on June 22, 2010 in Madrid, Spain. Sixteen universities from around the world are competing with their carbon-free solar powered houses in the 10-day 'Solar Decathlon' in Madrid, Spain. (Photo by Denis Doyle/Getty Images)
MADRID, SPAIN - JUNE 22: A woman visits the Tongji university of China bamboo solar-powered house on June 22, 2010 in Madrid, Spain. Sixteen universities from around the world are competing with their carbon-free solar powered houses in the 10-day 'Solar Decathlon' in Madrid, Spain. (Photo by Denis Doyle/Getty Images)