[IP] Re: Spam 'produces 17m tons of CO2'

[David Farber <dave@farber.net>]

Begin forwarded message:

From: Tony Finch <dot@dotat.at>
Date: April 20, 2009 8:17:38 PM EDT
To: dave@farber.net, tom_gray_grc@yahoo.com
Cc: Tony Finch <dot@dotat.at>
Subject: Re: [IP] Spam 'produces 17m tons of CO2'

Tom Gray <tom_gray_grc@yahoo.com> wrote:
> http://news.bbc.co.uk/2/hi/technology/8001749.stm
>
> A study into spam has blamed it for the production of more than 33bn
> kilowatt-hours of energy every year, enough to power more than 2.4m
> homes.
>
> The Carbon Footprint of e-mail Spam report estimated that 62 trillion
> spam emails are sent globally every year. ...

That works out at about 2kJ per spam (33e9 * 1000 * 3600 / 62e12), so a
server rejecting one spam per second would use 2kW. That's wrong by at
least one order of magnitude, probably more than two.

Tony.
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