The average household carbon footprint in the United States is 50 tons per year. Interestingly, the average household carbon footprint for the rest of the world is 10 tons per year.
The basic idea is to find a way to reduce carbon dioxide emissions, not only in things we commonly associate with harming the environment (gas, diesel fuel, electricity production, natural gas, etc), but also in the production of things we use on a daily basis (think milk jugs, plastic grocery bags, cardboard boxes, paper and don’t forget production and distribution of your food). Of course the calculation is subjective and dependent on many variables, which will vary from family to family and even person to person.
A site that has easy to read information is:
And this site has good examples:
This site lists specifics on how it calculates a carbon footprint. It has a lot of information, covers a lot of variables and is actually quite interesting:
The District’s carbon footprint has decreased thanks to extra effort taken by teachers and staff to conserve energy.