As if visitors to London didn't already have enough to see, the London Transportation Department has just unveiled a sleek zero-emissions double decker bus design.

London's redesign of its historic red bus will join Burbank's zero-emissions hydrogen fuel cell bus in making city-wide public transportation more sustainable.

The bus, which will be turned into a prototype by 2011, was created by architecture firm Foster + Partners as part of a contest to redesign the city's double decker buses.

The firm's winning entry comes complete with leather upholstery, wooden floors, panoramic views, and a glazed roof featuring energy-generating solar cells.

If London's double decker inspires just one other major metropolis to take on the sustainable redesign of iconic structures, I think it will have done its job.