I've started logging my petrol and electricity consumption, to try and figure out my CO2 footprint and just get a feel for the numbers. I'm surprised how it compares to food. Fuel+electricity comes to around 1.3 t/y, whereas my diet is around 1.9 t/y. Even a vegan diet is a full 1.5 t/y. I could likely cut fuel by the same amount by just getting a moped (a 0.1 t investment). Growing my own food on my property could nicely offset my car trips there (by perhaps 0.4 t/y), far more than the trips I do to finish my solar panel installation (0.1 t/y offset)