Grass fed cows are actually worse for the environment because they take up more land and therefore more water. Sorry, but your claims don't add up.
Do you even think about what you write? Water is not a problem with properly grass-fed cattle. Do you know where the water goes? To the ground, as piss. It's food for plants, it helps them grow better. It doesn't destroy nature, it helps it flourish.
Vegan propaganda is totally lost touch with the reality. You don't understand how complete ecosystems work, when water, nutrients, etc. flow from one place to another.
If you watch cowspiracy you'll know that there are a whole ton of people in the meat industry desperately trying to cover up the true impact of meat, so it doesn't surprise me that there's anti truth propaganda floating about.
What's wrong with the critique I linked to? IMHO it proves quite well that Cowspiracy is just a propaganda film, they don't even try to tell the truth.