Centred on research and development in Solar Energy Applications to the Built Environment, the International Conference CISBAT 2007, organised every other year on the campus of the Swiss Federal Institute of Technology (EPFL) in Lausanne/Switzerland, once more highlighted a significant number of scientific and technological innovations. The discoveries presented by researchers from five continents are all part of the effort to mitigate greenhouse gas emissions generated by buildings through the promotion of renewable energy technologies. These technologies applied to the built environment play a decisive role in reducing the human contribution to climate change.