With climate change and global warming an undeniable threat to the future of our planet, the need for renewable energy sources and the adoption of a greener lifestyle is paramount if society is to address what scientists and environmentalists describe as the defining issues of our time. In the worlds of design and technology, finding solutions to these increasingly urgent requirements are taken very seriously. For example, sustainability is now an architectural requirement as much as safety and security, with green principles governing commercial and residential design. But what are the world's most sustainable buildings, and where are they located?
Click through this gallery and take a look at some of the cleanest and greenest properties on the planet.