I said goodbye to McDonalds (and Wendy’s, Burger King, Taco Bell, Arbys etc.) 15 years ago.
Poor health isn’t a good trade for convenience.
It was right after I had the baconator for the first time.
It was kind of a wake up call, I just said “Holy shit what am I doing to myself”.
Replacing cows with yeasts that produce whey and casein (the 2 proteins in milk) is already underway. That could go along way to reducing methane and carbon dioxide.
https://phys.org/news/2021-01-yeast-cow.html