If you want that kind of info take a look here. Patrick Condon sent it to me. It's got info on all the energy requirements and CO2 outputs of various transportation methods.
http://www.sxd.sala.ubc.ca/8_research/sxd_FRB07Transport.pdf
With this stuff info I calculated that my electric skateboard uses 1/3 the energy of a person on the most efficient tram listed. Yay for being a bored engineering student.
Total carbon output = about 0.1g/km. Less CO2/km than a person breathes out in 30 seconds.