The carbon footprint shows how much carbon dioxide and other greenhouse gases a person produces in everyday life.  It measures the amount of fossil fuels and electricity someone uses up as well as the carbon footprint of the products they buy.

When we use our cars or heat our homes with oil or natural gas, carbon dioxide and various other gases are set free.  These emissions lead to a denser atmosphere and global warming.
You can measure your carbon footprint by using a calculator that you can find on various websites. It shows you in which way your living habits damage the environment. The carbon footprint usually measured in tons of CO2 per year. In America for example, every citizen produces about 28 tons of carbon dioxide and other dangerous gases a year, in Great Britain the amount is about 10 tons.