What is a Carbon Footprint?
Carbon Footprint is a physical measure of products and by-products contributing to greenhouse gases produced directly or indirectly by human activities. It is called "Carbon Footprint" because it is expressed in equivalent tones of carbon or carbon-dioxide over a period of a year.
You can learn more about it at : https://www.greensutra.in/greenpedia/carbon-footprint/
You can also estimate your own carbon footprint at : https://www.greensutra.in/greenpedia/carbon-footprint/carbon-footprint-estimator/