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Few things are more annoying than receiving emails from some cretin you never heard of asking your aid in disbursing the $571 million left to him/her. Or guarding your inbox against phishing. Sure, you can just hit "delete", but software developer McAfee reports that the act of writing and deleting spam consumes 33 billion kWh annually at a cost of $3.6 billion. Each spam email also incurs a carbon dioxide emission cost of 0.3 g. What are the options, other than universal adoption of advanced spam filtering technology?
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