I think such problem are unsolvable. In America, people can't live without meat and they will always justify it by bringing pasture raised cattle farm :/
So firstly there's been a lot of progress. I know people that grew up vegetarian in the 80s and there are so many more animal and environmentally friendly alternatives and people care more now than ever before.
Secondly, these things will change. If you look at the history of activism often there are people advocating against things hundreds of years before we see large changes (there is activism against forced labor in the Americas in the early 1500s even). So I've found it useful to accept the idea that we'll pass down this fight to the next generation and they'll probably pass it down to the one after that. It could be three decades or it could be three centuries but eventually things will change.
Secondly, these things will change. If you look at the history of activism often there are people advocating against things hundreds of years before we see large changes (there is activism against forced labor in the Americas in the early 1500s even). So I've found it useful to accept the idea that we'll pass down this fight to the next generation and they'll probably pass it down to the one after that. It could be three decades or it could be three centuries but eventually things will change.