The first fully carbon-neutral public building has been unveiled at the University of Copenhagen, Denmark.
The Green Lighthouse reduces energy consumption by 70% and incorporates many green design features such as heat recovery systems, photovoltaic panels, solar heating, LED lighting, phase change materials and geothermal heat.
Windows and doors are deeply set into the façade and are masked by automatic solar shades to limit solar intake into the building.
The building will be exhibited at the UN's climate conference in Copenhagen in December 2009 as an example of sustainable architecture.
The Danish Ministry of Science, Technology and Innovation, the University of Copenhagen and the City of Copenhagen were among those involved in the project.