The Negative Externalities of Spam

A short piece in The Times today says that spam emails are responsible for as much greenhouse gas emissions each year as 3.1m cars. Globally spam uses 33 billion kilowatt hours a year- enough to power 2.4million homes. The UK was the joint fourth biggest emitter of C02 from spam in the world with 50,000 tonnes a year. A interesting example of negative externalities.