Call me pedantic, but doesn't it have two wheels?
What advantages does this have over a standard bicycle? Is it solving a problem that doesn't exist?
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.