Its nice to find a City that is more action than talk or at least walk the walk. Olson has set itself a goal of being carbon neutral by 2050, and as a means to this end started investigation alternatives to fossil fuel for the public transport network.
Biomethane, which is what will fuel the public transport system is Oslo, is a by product of treated sewage. So where as previously the at one of the sewage plants in Oslo’s the gas was flared of creating a devastating amount of CO2. All of this is to change in September of 2009 when the Biomethane will be used to full 200 of the city’s public gasses on slightly altered engines.
As the old saying goes - One mans @#$% is another mans treasure.
More about this project at Eco Worldly