These "treats" you keep bringing up, most people call food. If you are against humans eating food, then this is the org for you. https://www.vhemt.org/

Now let's get to the meat of the issue. ALL human food production causes non-zero emissions, yes even the food you eat. Yes even if you grow it yourself. According to the link you provided "meat accounts for ~60% of green house gas emissions from food production." I would say, so what? Humans need to eat food and some food production is going to emit more green house gases then other food. Trying to optimize our diets to reduce our impact on the world at the expense of enjoying that world is something no one actually wants, including you. At the end of the day everyone has to eat food. So you say "But if we just cut meat production, we would reduce the green house gases of food production by 60%!" Well in less then 80years, the population of the earth is projected to be ~11billion. That is ~50% more people and thus 50% more greenhouse gases emitted from food. So now what do you now?

It's 2100ad, and we got rid of meat 80years ago, along with 10,000 years of human culinary culture and animal husbandry, and now we are right back where we started as far as green house gases (though probably worse because fossil fuels are still around). So what have you solved? What did destroying a huge part of the essence of human society accomplish? Hundreds and thousands of cultures were told that because burning coal and natural gas is cheaper and certian people will get rich from continuing to do that, those billions of people can't have certain kinds of food anymore. That's not a deal anyone will take, nor should they.