Smugly declaring - my CO2 footprint is 3 tonnes below the national average.
Well, OK, this is the UK national average, and we're not exactly the lightest treading nation in the world. And this was using the UK government's carbon calculator, which kindly does not include business travel in my travel footprint, allowing me to ignore every flight I've ever taken. And I don't own a car. So that's pretty much my entire contribution to saving the planet.
I'm still 0.3 tonnes above the target footprint, though, since all my household power is from fossil energy. I suppose the cycling does actually contribute a bit, as it means I'm using the washing machine more often as well. As for the green-ness of the home, well I'm renting. If I owned my house, I may well have put solar panels on by now.