CoolClimate Network has a neat little online calculator that will tell you how big your carbon footprint is. If you fly a lot, you're going to fail mightily being a friend of Gaia since it's the biggest contributor to a person's carbon footprint, hence Greta Thunberg refusing to fly. The calculator starts with where you live and makes the assumption from the start that your Zip Code pretty much tells whether or not you are a polluter, ie, richer Zip Codes mean more cars, bigger houses, etc. But it allows you to make "corrections" when inputting data (for instance, driving a hybrid or electric vehicle and being a vegan lowers your carbon footprint).
*Which reminds me, I gotta get out of this place. Aside from my gignormous carbon footprint, I'm going stir crazy.