Humans have been eating eat longer than driving, flying, and more.
Beef isn't terrible for the enviornment, is that companies are looking at one side of the sustainability of their organization and are running profit first. There's most likely reasonable ways to improve land use, or even increase cost of meat to make it better for the enviornment.
People your age, can't compare 1:1, people my age are doing keto, high protein date, carnivore diet, fasting / one meal a day and protein is on there, vs soy.
Stopping eating meat is not a solution itself. Especially for the world.
Especially for emerging economies and such, hah. The last bit really, IMO is just so short sighted and assuming that everyone in this world has a choice in their diet, what they eat and to tell them "no, meat is bad." is laudable at best.