while beef produces like 5% of global methane emmissions the oil and gas industry produce much much more... and beef can be solved by adding algae to their feed.
I can just talk about my own story. When I swapped everything I ate for meat, the depression went away, I've been collecting since 2018 or so, recently started adding everything I've learned into a github. https://github.com/cutestuff/FoodDepressionConundrum/blob/ma...
If you compare bio-availability of nutrients in plants and meat you'll end up with deficiencies that will have to be supplemented, this stuff is complex and probably a lot of us ruined their guts through fast food. The food industry cannot be trusted to get it right in fake meats...
On top of it all, the nutrient content of plants is going down for 30 years or so...