Your carbon footprint is the amount of carbon dioxide gas released by the energy you use to heat your house/office, power your appliances and operate your vehicles. Carbon dioxide emissions are the largest contributing factor to global warming. Once you complete your footprint calculation you'll be able to see where you need to reduce the most. Start using the calculator below and then return to this site to get help making a plan to reduce your carbon footprint. As you make changes you can update your footprint to find out what kind of impact it makes. Once you've registered you'll gain full access to Sun Rise: Your Complete Guide to Sustainable Living (300+ pages in full colour) and many more helpful resources. Simply click Calculate and then register your footprint. You can then return to update it whenever you like.