i agree, the test is totally unscientific and pretty crap. For instance, it doesn't let me chose an option for "don't own a car", i hafta choose that i almost always travel with other people when in a car(!), and that 'my' car uses the best fuel efficiency. I also travel in a car on average 1-25km a week, but the options go from 0, then 25-100km. I also have no idea what size my house is, but using the second highest option, I score:

TOTAL FOOTPRINT 1.9
IF EVERYONE LIVED LIKE YOU, WE WOULD NEED 1.1 PLANETS TO LIVE ON

i don't mind going and living on mars, just as long as it isn't a team of british scientists who design my landing gear/procedure