You have probably heard about the concept of a carbon footprint. The carbon footprint is a quite common indicator of the bad impact on the environment caused by consuming goods and services. Sometimes it comes up in unexpected contexts. For example, I was looking for a hotel room recently and they presented the environmental impact for staying one night in their hotel room in the form of the carbon footprint. The carbon footprint can be used for basically everything. Here are more examples of things for which you can calculate a carbon footprint: a mile driven in a specific car, buying a pound of beef, even just breathing over the course of one’s life. The carbon footprint tells you how much carbon dioxide emissions (and methane) each thing produces.