CO2 (carbon dioxide) is a greenhouse gas (GHG) that is emitted in the process of making a product or delivering a service. While CO2 accounts for almost 80% of all GHGs and can almost entirely be attributed to the burning of fossil fuels, individuals like you and me also contribute to global warming, from the meat we eat to the Insta posts we publish, practically everything we do has some negative effect on the climate or the sustainability of our planet.