What is a carbon footprint? (defined by carbonfootprint.com)

A carbon footprint is a measure of the impact our activities have on the environment, and in particular climate change.

It relates to the amount of greenhouse gases produced in our day-to-day lives through burning fossil fuels for electricity, heating and transportation etc.

The carbon footprint is a measurement of all greenhouse gases we individually produce and has units of tonnes (or kg) of carbon dioxide equivalent.

Info Source: http://www.carbonfootprint.com/carbonfootprint.html