FYI, the use of rare earth elements has very little to do with «green tech», it is a common requirement for everything that is usually called «high tech». (wattsupwiththat.com)
As for Rare earth metals: yeah, great idea, would that you had said this earlier. (alephblog.com)
The growing shortage of rare earth minerals underscores how truly difficult the transition to a clean energy economy will be. (treehugger.com)