Those boffins at Accenture Technology Labs apparently believe that utility computing is good for the environment (and hence as I said good for ducks - thx to Suw for the notes.). They even talk about a future spot market in computing resources.
Of course, resource brokers is old news to any readers here who hopefully are well versed in the impacts of commoditisation. I can't really claim any credit - I take my ideas from history, whether it's Petrarch, Schumpeter or McCarthy.
In any case "anytime you think of an idea it is likely that someone, somewhere else in the world is independently thinking or has thought of the same idea".
Damn, nicked that one too.
The only downside is the potential for more consumption but in the short-term it should hold some benefit. Longer term, we're going to have to solve those thorny energy production issues.
--- Update 6th October 2013
Many years later, at the Royal Society, we're still talking about utility computing and sustainability.