It's bad for the environment, it's bad for individual health, it's bad for collective health (breeding drug resistance and causing pandemics), and all that is before we even talk about the mass scale of needless suffering inflicted on other sentient beings.
I don't know what the solution is, because as soon as you mention eating less meat people laugh at you or get super defensive. "What, do you care about the animals?" is something I've had people say to me in all seriousness.
When I gave it up it felt similar to giving up cigarettes, you get depressed and feel exiled from a joy you used to share with others. But that's what addiction does to you and once you get to the other side you wonder how you even participated in such negative behavior in the first place.
My fantasy solution is everyone needs to go get a meat consumption license by going to a farm and killing an animal with a knife in their hands every, say, 10 years. If you can't do it, then you have no business participating in consuming it. Bonus points if you're a regular hunter.
[1] https://ourworldindata.org/grapher/animals-slaughtered-for-m...