There are lots of different calculators online that measure your global impact. The first one I tried a year ago was this one, and the results sort of turned me off these kinds of calculators.
Since my particular country at the time wasn't a choice (Kyrgyzstan), I tried a couple of neighboring countries (China and Pakistan). I put in the exact same answers for both countries and came up with very different footprints- 7.6 in China and 1.7 in Pakistan. In the US it's 11 (whether I put in our Kyrgyzstan numbers or our current numbers), but I only need 2.5 planets here. A footprint of 7.6 in China required 4.6 planets.
I just don't think we'd have that much greater negative impact on the environment if we'd been living a couple of hundred miles away in China. Shouldn't the same amount of energy usage result in the same global impact whether you live in Kyrgyzstan or the US? I guess all those high-living expats in Pakistan don't need to worry about their global impact.