Thank you for the tip!!
The paper you linked to is certainly an interesting read - I will incorporate some of its ideas into my 2nd edition.
Your welcome for me the ten points were what stood out most in their working paper in that Bitcoin was able to solve all these problems at one time.
1) Proof of Ownership (Obsoletes Notaries)
2) Dispute Resolution (Obsoletes Mediators)
3) Record Auditing (Obsoletes Accountants)
4) Smart Property (Obsoletes the Police)
5) Decentralized Stock Exchange (Obsoletes Centralized Stock Exchanges)
6) Highly Efficient Transfer of Assets (Obsoletes Banks, Debit Cards, Money Transmitters)
7) Full Control over one's own assets (Obsoletes Central Banks, Regulators of not only banks but other parts of the financial sector as well)
8 ) Conditional Transfer of Assets (Obsoletes Lawyers)
9) No Inflation
10) No Business Cycle
Point 6 applies to your paper in that the Highly Efficient Transfer of Assets applied through an economic lens can also be looked at from an environmental perspective.
The scale of energy usage between a typical fiat based payment system such as the SWIFT per country and a bitcoin based one such as 37coins using SMS and Android phones seemed like a neat tangent.
Simply put a low energy phone vs payment orders over the SWIFT Financial Network.
From your analysis you had lifecycle data and I was able to get a rough analysis of energy usage and environmental impact of Bitcoin versus Mining Gold or the current Fiat Payment system in aggregate.
If you were curious on the types of energy used to produce that electricity and want to update those numbers from approximates it would probably help to look at Daniel Yergin The Quest and Vaclav Smil Energy at the Crossroads Global Perspectives and Uncertainties to see the energy linkages to energy type whether coal, natural gas, oil, nuclear or intermittency based energy like Solar and Wind power.
It's a good read for energy analysts
http://www.bitcoinmicrofinance.org/37-coins-send-bitcoin-with-a-text/http://howtoexportimport.com/Difference-between-Swift-and-wire-transfer--434.aspxIts kind of a small case area to evaluate, but it has a big impact in terms of financial transactions and energy usage.
Just a blurb, and thanks for sharing and I look forward to your 2nd edition when it is completed.