If you’re not a vegan or evolving in that direction, you’re a part of the problem, not the solution. The solution is environmental sustainability, and if that’s not you, then you’re out-of-date and out-of-touch, an oblivious genus steadfastly nearing the brink of extinction.
While the principal purpose of veganism is the abolition of slavery, once and for all, for all, the recognition that for any to live free, all earthlings must live free in a world free of Authority, there is too that little nagging reason of survival.
To ignore the more-than-obvious environmental impacts of animal agriculture, that is climate change, topsoil erosion, deforestation, hypoxic dead zones, air pollution, water pollution and freshwater depletion is to wander foolishly into the void of nonexistence. 
And, by-the-way, if you’re not a vegan and you fancy yourself an environmentalist, you’re not.
Being that we’re on the topic of the environment, allow me to interject the devastation the military wreaks on the planet. You might say it goes without saying. But understand the gravity, it is monumental. And not just from the violence it thrives on, but from every aspect and every connection to its predacious nature is a violation of environmental harmony.
Then again, perhaps you don’t care that the environment is going to hell in the proverbial handbasket. Even if you’re not in denial, you might reason that you may well die before Homo sapiens perform their final acrobatic dive off the precipice of existence. And let’s agree, you’d probably be right.
But for the upcoming generations, you’re stacking the deck against them. And all because of your willful disregard of the many dire facts screaming for your attention.
It wouldn’t do for me not to mention the covert and overt psychological effects of killing and cruelty, enslavement and exploitation, whether directly or paid for at the supermarket, we are living them. War, violence, oppression, racism, speciesism, inequality to name but a few of humanities’ evils all have their roots in our attitudes toward the most vulnerable. And that starts with the animals, the most vulnerable.
It’s simple. All oppressions are intertwined. And it doesn’t take deep reasoning to reckon that out, only a readiness to see the interconnections that bind us all together in this earthy web.
 Cowspiracy, the Facts. http://www.cowspiracy.com/facts/
 UN urges global move to meat and dairy-free diet https://www.theguardian.com/environment/2010/jun/02/un-report-meat-free-diet