I'm not even a militant veggie, let alone a vegan but there's so much ridiculousness in this I'm going to have to break it down.
1) Yes originally the hunter gatherers were just following their instincts and it was natural. The point is the way we farm animals now is not natural. We've become so good at it we've literally created meat factories. Livestock farming contributes 18% of human produced greenhouse gas emissions worldwide. This is more than all emissions from ships, planes, trucks, cars and all other transport put together. Pretty different to a pack of lions killing an antelope and eating it.
2) You might be getting confused between buffalo and cows in India being that they both produce beef. Can't find anything that backs up your Indian "fact" but you can see here that it's the biggest beef exporter in the world
https://qz.com/india/643433/all-you-...dia-in-charts/ which might explain your ozone layer worry.
3) The cars/airplanes argument. Congratulations, you've got the same tools of debate as those Texan gun nuts use after school massacres in the US. I don't know what the figures are for cars hitting people but I don't think they account for 60% of global biodiversity loss
https://www.wwf.org.uk/sites/default...rt_SignOff.pdf
Airports cover a bit of land yes, probably not the same 13 billion hectares of those plants and forests you care so much about that are converted into cropland to feed agriculture every year though.
There is a movement to eventually ban single use plastic, why do you think you're being charged for that bag in Tesco? And of course they're not going to get banned immediately and completely, don't be so silly. You can't just ban something that's so ingrained in everyday life with a click of the fingers, it'd be chaos. It's a gradual phasing out over years, decades probably. Maybe the same as will happen with meat, maybe not.
Like I said, I'm not a militant veggie. I've made my choice and I feel good about it but I'll happily sit next to my mate who's eating a beef burger if that's his, and I won't say a word about it. On the flip side I don't know why some people who choose to keep eating meat have so much animosity towards those who don't, it actually has very little bearing on your lives.
Posts like yours are a great example, you've got such a beef (thankyou) about it that you're just grasping for nonsense to make your point. "people say mass meat consumption has a negative effect on the environment so let's ban cars because sometimes people are hit by them" is just embarrassing from what I assume is an adult with a brain.