The food system is a very complex beast. There are people who are going to get their food at Wal-Mart or at Safeway; they're not going to the farmers' market. Those people need choices too.

Do all your eating at a table.

Perhaps more than any other, the food industry is very sensitive to consumer demand.

Every major food company now has an organic division. There's more capital going into organic agriculture than ever before.

But that's the challenge -- to change the system more than it changes you.

A vegan in a Hummer has a lighter carbon footprint than a beef eater in a Prius.

It's more important that you eat vegetables, even if they are conventional -- I'm talking about for your health -- then it is until you wait until you can afford organic, or you can find organic.