This week
, correspondent Jeff McIntire Strasburg
sheds some light on the murky question of ethanol versus biodiesel. We
speak with Mark Oberholzer, a runner-up in the 2006 Metropolis Next
Generation Design Competition, whose plan for roadside turbines aims at
getting something back from the flow of traffic. We also speak with the
designer of World Without Oil, an online alternate reality game that simulates a world in the throes of an oil shock.  LISTEN (9 min)