Earth Pie

The results in from footprintnetwork.org - it takes 3.8 Earths to support my lifestyle. Noms.
In detail -
Services: 52%
Food: 20%
Mobility: 14%
Goods: 9%
Shelter: 5%

So - what can I do better?
Of the few suggested scenarios, only two - eating less meat and flying less - will reduce my footprint substantially, by 0.2 Earths. I suppose that's something to work with. Unfortunately the quiz doesn't capture some of the subtleties of my college-student tactics, like slipping into the dining hall to eat only the food they are about to throw away.... Nor is it easy to differentiate my car- and meat-based lifestyle at home from my preferred lifestyle on campus.
Out of curiosity I took the quiz again giving what I imagine were stellar answers to all the questions, and it appears as an American it is impossible to live on less than 3.1 Earths.
Well, rats.
Then for fun I took the quiz as an Argentinian with my original answers (although the format is different) and came up with one nice, round Earth.