Nothing to do with Anything

So, out of curiosity, I decided to 'calculate' my 'carbon footprint', googled the term, and tried three different services. One was carboncounter.org, a local [to portland] based aplication, another was climatecrisis.net, which was ?affiliated? with an inconvenient truth, and the last was the nature conservancy. I produce 15, 8, and 33 tonnes of carbon yearly, respective to each website. Wait, what? Same types of questions at each place, answered them all as similarily as I could, and got three vastly different answers. Okay then. Guess I'm not going to believe in all that without being more discerning than usual.