What advantages does this have over a standard bicycle? Is it solving a problem that doesn't exist?
http://www.timesonline.co.uk/tol/news/uk/science/article2195...
But it was discussing walking, not riding (far more efficient), and used common milk as the calorie provision (effectively a worst-case scenario).
Please read this. Eating meat is the largest factor for green house gases. So if you want to go Green stop eating meat.
What advantages does this have over a standard bicycle? Is it solving a problem that doesn't exist?