URBAN - Buildings heated and cooled by design rather than by fossil fuel energy - solar cities are a realistic option

Barcelona has a housing density of 93 du/ac.
Paris city block with a housing density of 120 du/ac.
'Second only to air, is light and sunshine essential for growth and for health; and it is of Natures most powerful assistants in enabling the body to throw off those conditions which we call disease. Not only daylight, but sunlight; indeed, fresh air must be sun-warmed, sun-penetrated air. The sunshine of a December day has been recently shown to kill the spores of the anthrax bacillus.' Douglas Galton
http://www.lowtechmagazine.com/2012/03/solar-oriented-cities-1-the-solar-envelope.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+typepad%2Fkrisdedecker%2Flowtechmagazineenglish+%28Low-tech+Magazine%29