Just because there are issues with pesticides, subsidies, and other aspects of agriculture, doesn't make your statements on meat true.

Meat takes a lot of energy to produce. It makes sense intuitively: think about how much energy was spent to raise you. That energy has to come from somewhere, and producing it has environmental side effects. Enormous ones. Don't underestimate the harm done by meat production to the environment.

Sustainably farmed eggs and fish are much more environmentally responsible, and provide the vitamins you mention. In the future all the essential nutrients will also be available via bacterial cultures.