Letter: The cost of money

Published 22 June 2011

From Pam Lunn

With all the number-crunching on power-hungry computers needed to run the virtual money mentioned in your technology special (4 June, p 23) I have a question: just what is the carbon footprint of a bitcoin?

Kenilworth, Warwickshire, UK

Issue no. 2818 published 25 June 2011

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