Oh but it ain't.
A world without meat eaters would allow herbivores to proliferate without other checks to their population (apart from old age and disease). There would be surges of vegetation then grazer growth, over eating and famine, plus the enormous population would increase methane levels; methane being a much more effective greenhouse gas than carbon dioxide.
Imagine also the effect on he atmosphere should herbivores eat and eat and eat, reducing plant populations and thereby photosynthesis and the earth's oxygen-producing capability. The inevitable collapse and mass death of herbivores would produce enormous amounts of methane as they decay, further heating the atmosphere. Consequently, more water would evaporate, drying rivers, lakes and lowering water tables, and not so easily reach dew point in the hotter air. Desertification would be global making it very difficult for plant populations to recover.
It is entirely natural and necessary that predation occurs to keep plant-eating pests in check. There us plenty if evidence that shows the switch to meat eating by our ancestors was a driving factor that allowed for development of a larger brain, so here too, even though we have alternative sources of protein, eating meat is entirely natural for humans. Having said that, if we are to be above the animals then we should not treat them as horrendously as a mass consumerist society does, in the name of profit.
As an omnivore who eats meat occasionally, I'm quietly doing my bit to save the planet, while you extremists guys go around preaching bubbles from your high horse.
but in my former fun life I was a rare/med rare man. Bleu if I trusted the place. My gf used to get them well done, but I've managed to get her on to medium now.
