why a hybrid car in every driveway cannot happen

http://www.treehugger.com/files/2009/06/goodbye-fossil-fuel-dependence-hello-rare-earth-dependence.php

D: supply already matches demand.

"A typical hybrid car, such as a Toyota Prius, contains around 25 pounds of rare earth metals -- mostly lanthanum in its rechargeable battery and neodymium in its drive motor."

D: plus the platinum in the fuel-cell dream is subject to similar market pressures on price.


http://www.newscientist.com/article/dn16275-platinumfree-fuel-cell-promises-cheap-green-power.html

"Platinum has so far been the metal of choice because the membranes used in fuel cells create a very acidic environment, and the metal is stable in such corrosive conditions."

http://www.newscientist.com/article/mg17924123.600-platinum-crisis.html

"But even if only 1 million fuel cell cars were built per year, each with between 70 and 140 grams of platinum, the worldwide supply of platinum would be insufficient."

D: Various nations are experimenting with no-car residential zones.

http://www.treehugger.com/files/2009/02/car-free-suburb-planned-for-melbourne-australia.php

Barring a scenario with 95%+ of people in the world suddenly vanishing, we just cannot give every home a sedan of their own...