Carbon Footprint added to Merriam-Webster Dictionary

Here is the link to the Merriam-Webster website entry.

Carbon footprint (1999): the negative impact that something (as a person or business) has on the environment; specifically: the amount of carbon emitted by something during a given period.

On that note, remember that Passive House building energy standard creates buildings with the lowest certified carbon footprint (for operation) in the world.