All those spam e-mails in your inbox are more than just a nuisance, they're also clogging up the skies with carbon dioxide. The carbon emissions created by the 62 trillion spam emails sent last year were equivalent to those emitted by burning 2 billion gallons of gasoline to run a car, according to a report by the computer security firm McAfree. Most of the energy used (by you and the electrical grid) comes from the effort required to delete also those unwanted emails.

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