What we're reading: butter into biofuel

1.) If you build it, they will come -- but not for electric vehicles, Josie Garthwaite writes.

2.) Philadelphia-based BlackGold is turning butter into biofuel.

3.) Fuel-efficient hydraulic vehicles are back and better than ever.

4.) Happiness, revisited: does what you spend money on matter?

5.) Could San Francisco learn a thing or two about urban planning from New York City? Architecture critic John King says yes.

This post was originally published on Smartplanet.com