Vegan sounds too extreme for me, but I'm trying to go vegetarian. Just by eating less meat helps too, it's all about taking it step-by-step.
I've stopped eating chicken and eggs for the past couple of years now due to the cruelty, and I'm slowly working towards not eating other animals as well. Again it takes time..
I'm not saying that I am a fan of PETA though,
they are a very lousy charity.
I figure there is a lot of good tasting food besides meat. In fact, I just had a baked mixture of veggies that was delicious(cooked onions and mushrooms are great).
I've also substituted almond milk on cereal. While I don't like drinking it alone(might need to acquire a liking for it), it tastes the same when mixed with cheerios at least.
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Looking into the energy cost of meat, it's also amazing how beef requires 13kg of farmed grain+30kg of foraged plants for every kg of meat.
Even the most efficient chicken "Broilers" is a little over 2 kg, and that would pretty much be caged chicken. I thought humans were the most successful species on the planet, but chickens almost outnumber us 3:1!
Then there's the extra water and energy necessary. And a growing concern about soil erosion...
And the population still continues to grow, of course.
We need a zombie apocalypse stat, or we're going to starve!