The carbon footprint of email spam

Source: McAfee
"Until now, spam’s impact has been measured in time, money, and aggravation. It turns out there is a massive environmental impact as well. After McAfee commissioned climate-change consultant ICF International and spam expert Richi Jennings to calculate the environmental impact of spam, the results that came back were startling. Together they found that the energy consumed in transmitting and deleting spam is equivalent to the electricity used in 2.4 million American homes, with greenhouse gas (GHG) emissions equivalent to 3.1 million passenger cars."