I’m so, so hopeful that I’m a few decades people will look back at our terrible indoor air quality the way we look at indoor smoking, breathing in leaded gasoline fumes, etc. One of those things that just seems like an unimaginable way to live once you’ve experienced the alternative.
Another great one is seitan aka wheat meat, and it’s really cheap if you make it from flour rather than vital wheat gluten. Still pretty cheap if made from vital wheat gluten too.