Baraka_Guru

I don't have one handy, but look at it this way:

Many vegetarians, vegans, and plant-centric omnivores take the "diet for a small planet" view. aberkok touched on this already. The average North American diet is unsustainable. If you look at the ecological effects of the meat- and dairy-production industries, it's quite depressing. The model of food production is broken and much of the blame can be placed on market forces. We want lots of meat and dairy; our culture demands it. In order to keep affordability, we operate a highly damaging set of industries.

As generalists, some of us make the conscious choice to eat in such a way that isn't going to limit our viability for survival down the road. We can eat meat/eggs/dairy if we need to, but I would argue that we don't. There are some exceptions, sure, but I'm talking about our culture in a wide sense.

But what you say is a bit off the mark: a vegan diet isn't eating "one food source"; it's eating everything but animal-derived foods. There's a difference.

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Knowing that death is certain and that the time of death is uncertain, what's the most important thing?
—Bhikkhuni Pema Chödrön

Humankind cannot bear very much reality.
—From "Burnt Norton," Four Quartets (1936), T. S. Eliot