One surprise is how deeply the food system is implicated in climate change. I don't think that has really been on people's radar until very recently. 25 to 33 percent of climate change gases can be traced to the food system. I was also surprised that those diseases that we take for granted as what will kill us - heart disease, cancer, diabetes - were virtually unknown 150 years ago, before we began eating this way.

Pay more, eat less. Diversify your diet and eat wild foods when you can.

The single greatest lesson the garden teaches is that our relationship to the planet need not be zero-sum, and that as long as the sun still shines and people still can plan and plant, think and do, we can, if we bother to try, find ways to provide for ourselves without diminishing the world.

The whole problem of industrial agriculture is putting all of your eggs in one basket. We need to diversify our food chains as well as our fields so that when some of them fail, we can still eat.

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.

We're supposed to show people how the world is, to give them the tools they need to make good decisions as citizens or consumers. Depending on what your values are - the environment, your health, animal welfare - the answers are going to be different for every person.

The best farming systems are ones where animals and plants are put into a synergistic relationship.