Half of all broccoli grown commercially in America today is a single variety- Marathon- notable for it's high yield. The overwhelming majority of the chickens raised for meat in America are the same hybrid, the Cornish cross; more than 99 percent of turkeys are the Broad-Breasted Whites.

If we address frankly what is evoked by cheese, I think it becomes clear why so little is said. So what does cheese evoke? Damp dark cellars, molds, mildews and mushrooms galore, dirty laundry and high school locker rooms, digestive processes and visceral fermentations, he-goats which do not remind of Chanel ... In sum, cheese reminds of dubious, even unsavory places, both in nature and in our own organisms. And yet we love it.

The sheer novelty and glamor of the Western diet, with its seventeen thousand new food products every year and the marketing power - thirty-two billion dollars a year - used to sell us those products, has overwhelmed the force of tradition and left us where we now find ourselves: relying on science and journalism and government and marketing to help us decide what to eat.

Meat is a tremendous environmental challenge. It contributes enormous amounts of greenhouse gas, especially beef eating.

Originally, the atoms of carbon from which we're made were floating in the air, part of a carbon dioxide molecule. The only way to recruit these carbon atoms for the molecules necessary to support life-the carbohydrates, amino acids, proteins, and lipids-is by means of photosynthesis. Using sunlight as a catalyst the green cells of plants combine carbon atoms taken from the air with water and elements drawn from the soil to form the simple organic compounds that stand at the base of every food chain. It is more than a figure of speech to say that plants create life out of thin air.

I think there's a real tension between capitalism and morality. That's not to say these systems aren't powerful and useful, but to assume that capitalism can somehow assure moral behavior or character, that's just a pipe dream.

In 2008, a year of supposed 'food crisis', we grew enough food to feed 11 billion people. Most of it was not eaten by humans as food, however.