Although not yet a reality, this adventurous design goes well beyond being a mere concept. Designed by Stefano Boeri - architect, academic and former editor of design and architecture magazine Domus - his Bosco Verticale is a towering 27-story structure, currently under construction in Milan, Italy. The Bosco Verticale is designed to produce and optimize energy. It should help to balance the heavily polluted Milanese microclimate.
According to Inhabitat.com:
Each apartment in the building will have a balcony planted with trees that are able to respond to the city’s weather — shade will be provided within the summer, while also filtering city pollution; and in the winter the bare trees will allow sunlight to permeate through the spaces. Plant irrigation will be supported through the filtering and reuse of the greywater produced by the building. Additionally, Aeolian and photovoltaic energy systems will further promote the tower’s self-sufficiency