This document discusses carbon footprints and provides examples of carbon footprints for various activities. It defines a carbon footprint as a measure of the total greenhouse gases emitted due to a population, system or activity. It explains that carbon footprints are calculated based on carbon dioxide, methane and other greenhouse gas emissions. The document then gives examples of the carbon footprints of activities like web searching, traveling by different modes of transportation, and estimates the average carbon footprint per person globally and in India. Finally, it outlines some impacts of large carbon footprints and provides tips for reducing individual carbon footprints.