Is the black background colour of my blog ecological?

Blackle VS Google

What's going on?
http://ecoiron.blogspot.com/2007/01/black-google-would-save-3000-megawatts.html

How is Blackle working?
http://ecoiron.blogspot.com/2007/08/history-in-january-2007-mark-ontkush.html

What's Google's answer?
http://www.quickonlinetips.com/archives/2007/09/google-clarifies-black-google-blackle-may-not-save-energy/
http://googleblog.blogspot.com/2007/08/is-black-new-green.html

What about a test?
http://techlogg.com/content/view/360/31/

Verdict:
I prefer Blackle
I prefer Google