I haven’t read it, so I’m it not disputing it. I just think it doesn’t go far enough. You can’t have a plant based ecosystem. You just can’t. I have a garden, I grow vegetables. But then I HAVE to add fertiliser, which is animal manure, or I can’t grow any more vegetables. So everyone can’t be vegan. A minority can, with input from other systems (and often oil derived), but not everyone. You need animal fertiliser. It’s a cycle, and animals are part of it. I’m not a professional environmentalist, but I do have a biology degree, and I’m a keen amateur, and I can’t think of a single plant only ecosystem. Not one.
There are various ways of raising animals. There are animals that live fairly natural lives and eat grass, with few additional inputs and minimal trucking about or environmental changes. And then there are intensively reared animals raised indoors on highly concentrated food, moved around a lot and with a lot of additives. They have very different footprints. You can’t lump them all in together and say that they are all as bad as the worst one.
Animals do more than just fertilise. There is lots of land that isn’t suitable for arable growing, and can’t be cleared mechanically. When calculating that we need eg 2.5 earths if everyone eats meat, but only 1 if everyone were vegan, is this land discounted? I’ve always wondered.
Also, just because you aren’t eating them, does not mean animals aren’t dying. Pest control for vegetable crops both during growth and storage is a major headache. It involves significant labour, chemical and/or plastic use. Frequently, poison, traps or guns, especially for rodents, pigeons, rabbits, foxes and squirrels. I have no idea how it compares, but if you eat beef, how many individual cattle do you eat in a lifetime? Compared to how many rabbits are shot or rats are poisoned to preserve a bean or lentil crop? It seems very naive and wrong to me assume that mass-veganism is any kind of answer here, even if it were possible.
That said, it doesn’t mean I think we should continue to eat meat the way we do now. Most of us eat far too much cheap intensively reared meat which is raised very poorly for the countryside, the planet and the individual animals. Dairy even more so. Fish even more than that. I was (before I went broke) eating much less, very local, higher quality meat and dairy, and more plants. Now I just what I can afford (which is no meat at all, save what I am gifted and anything left in the freezer, and small amounts of bog standard meat for DD. I am in no position to be choosy, sadly. If I ever am again, I will go back it). It still displaces flora and fauna, causes pollution and individual death and suffering, but the least amount I can, while remaining alive myself.