"Should you hand a bunch of capital to green M.B.A.'s? No. Because in the typical business-school model, entrepreneurs raise a ton of money, lose a lot of it, eventually break even, and then start making money. But in the real world, there's an enormous amount you just can't anticipate. And it's really disconcerting when your bank account is going down rapidly." -- J. J. Mullane, former green M.B.A. and president of TerraVera, a natural-foods start-up in Redwood City, Calif.

* * *