Carbon Footprint is the total amount of greenhouse gas emissions (GHG) such as carbon dioxide (CO2) that a business, organization, product, household or personal lifestyle produces. A bigger footprint is harder on the planet. The EPA has developed a Household Carbon Footprint Calculator to provide a rough estimate of a household's GHG emissions. Greenhouse gases act like a blanket by trapp heat in the atmosphere making Earth warmer than it would otherwise be. 

Reduce, reuse and recycle are ways humans can reduce their carbon footprint and thus their impact on the planet. (Photo: Flickr)