Why?
* Author writes """it’s more accurate to say that vegetarian diets are “less awful,” not “better,” than omnivorous diets""". He gives no hard numbers to back it up. Less awful IS OBVIOUSLY the same as better. According to many sources, that are well presented in the Cowspiracy documentary (among others) it is shown that a vegetarian diet, and specially a vegan diet, is A LOT less awful then an omni diet both environmentally, ethically and considering health impact.
* He argues vegetarians eat more staples. And that they are usually grown as mono crops, thus bad for the environment. He forgets that animals slaughtered for meat have been eating staples all their lives. A large part of the staples are grown for life stock; this makes meat so inefficient in the first place. The author is seems to know that it is also grown for life stock, but then continues that vegetarians are responsible for the monocrop disaster. Clearly misguided he is.
* Showing pictures of hippies to re-enforce the idea that vegetarians/vegans are some treehugging margin group. Whoever lives in a cosmopolitan city knows this is not true, or not anymore.
What I do agree on: eat with the seasons. But simple economics of "eat what is cheap" should help with that. It is that supermarkets choose to put the "high price" on produce all year long, except for a discount crop maybe. This is because produce does not pull customers.
What pulls customers? Cheap meat, and cheap beer. That's why there's always some meat on offer that costs less per kilo then bell peppers in the supermarkets near where I live.
If we want to save the planet from the rather imminent "mass extinction" (lets not call it "global warming" that sound waaay to nice), we should not optimize for consumerism but for sustainability. And meat eating is simply not sustainable.