A few years ago I audited a course about Archigram at the University of Pennsylvania, just something to do on a Wednesday morning before I went to work – but one of the things that indirectly came out of that experience was BLDGBLOG. It's interesting to note, then, that one of the other people in that class now writes Brand Avenue; another's work was featured here on BLDGBLOG last year; and, this morning, another course attendee emailed to point out a proposal that he's helped assemble and conceptualize, about hydrogen-powered urban design in Iceland.

As the designers note:
It has long been known that algae produce small amounts of hydrogen as a byproduct of photosynthesis. In 1999, researchers in Berkeley observed that algae alternate between hydrogen production and normal photosynthesis depending on the chemical environment. Depriving algae of oxygen and sulfur, the researchers greatly increased the hydrogen production and triggered the algae to produce hydrogen for an extended period of time. Another research group also discovered that algae will sustain simultaneous production of hydrogen and oxygen from water by illuminating the algae and depriving it of carbon dioxide and oxygen. Researchers estimate that a small pond (1.5 acre or 10 meter diameter) will produce enough hydrogen on a weekly basis to fuel 12 cars.
Of course, a part of me wonders if this whole thing would be easier to solve if we just got rid of those 12 cars – but I understand that that wasn't the point of this design exercise.