Key Findings:
- An estimated worldwide total of 62 trillion spam emails were sent in 2008
- Globally, annual spam energy use totals 33 billion kilowatt-hours (KWh), or 33 terawatt hours (TWh). That’s equivalent to the electricity used in 2.4 million homes in the United States, with the same GHG emissions as 3.1 million passenger cars using two billion United States gallons of gasoline
- The average GHG emission associated with a single spam message is 0.3 grams of CO2. That’s like driving three feet (one meter) in equivalent emissions, but when multiplied by the annual volume of spam, it’s like driving around the Earth 1.6 million times
- The average business email user is responsible for 131 kg of CO2 per year in email-related emissions and 22 percent of that figure is spam-related.
- The energy required annually to create, send, receive, store, and view spam adds up to more than 33 billion KWh, approximately equivalent to 4 gigawatts of baseload power generation or the power provided by four large new coal power plants.
- ICF estimates spam-related emissions for all email users at an annual total of 17 million metric tons of CO2
- Users viewing and deleting spam is the largest energy drain associated with spam, almost 18 billion kWh or 52 percent of total spam energy.
Source: McAfee



