As if spam wasn't bad enough when it simply flooded our inboxes with promises of vast fortunes held captive in foreign lands and miracle drugs to cure all of life's ills, new research suggests that it causes as much greenhouse gas to be released each year as 3.1 million cars. The study, conducted on behalf of computer security company McAfee by ICF International showed that nearly 80% of energy use associated with emails was taken up by users deleting unsolicited messages and searching for legitimate correspondence.

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