Counting the carbons

Kyle over at Green with a Gun has created a spreadsheet to measure consumption, using a unit of measure he calls the carbon.
His post on it contains all the details, but basically he's averaged out what each person in the world should be consuming (in terms of carbons) and then also crunched a bunch of numbers to work out what all sorts of things are worth in carbons.
It's then relatively straightforward, you put in your numbers for the month and it tells you how you compare to the the rest of the world and also to the ultimate goal, which is carbon-neutral.
I had a look at it tonight and put in some guesstimates for July and we come out at -75 carbons per person for the month. The aim is of course to be at 0 or in the black. Average Western consumption is -1000 carbons, average world wide is -312. So we are not doing too badly at all. But mine are very rubbery estimates, particularly on things like food consumption - I bet that ends up way more than I guessed, when I actually measure it. It will be interesting to see how we track.
Of course, keeping my children malnourished and hypothermic sure helps to keep that carbon expenditure down - I knew there was a reason for it!