Where the Zombies Are Going
Depending on where you live, eating baby spinach or arugula is almost like eating a burger, in terms of greenhouse gas emissions. It's that intense. Sure, if you live in the Central Valley of California, or in Florida, not so. But most people live very far from those places. If you live east of longitude 100 [Draw a line through the middle of the Dakotas—MKB] and north of, say, Jesse Helms country, you have no business eating greens at all between October and June. Again, you know, you're free to do whatever you want, but if you want to be really careful about your greenhouse gas footprint, this is what you should do.
By the way, does the above mean the Enlightened Ones are about to throw arugula “under the bus”?
Of course, in a rational world, the obvious solution would be to ship vegetables by nuclear-powered truck.
On the other hand, if “we don't need nuclear power” then there must be a better solution, which also means there's no need to give up winter greens.