Without including the why and size, It's impossible to properly compare nation to nation.
Bingo
Why would it look much different? The report is about emission reductions, and the land area of most nations has not changed significantly. For those that have, then the per unit area metric is even more worthless.
Interesting comment. A nation like Japan that has a 127 million people in an area 1/2 the size of BC would be generating a large multiple of ghgs per sqft as compared to Canada.
Does this mean that is the manner in which we measure?.. No, but what it does do bring into the question the current logic behind the standards that the IPCC et al have set which allows a ranking similar to the one in the OP.
What I'm really saying here is that the standard and measuring technique is essentially arbitrary and the actual 'rankings' in this case are not necessarily accurate (depending on the perspective you take)