Gonna need a source for that claim on higher inputs for human food.
If economics is your excuse for raising animal feed instead of human food then it’s just another knock on capitalism. (Although if you calculated the economic cost of raising/slaughtering/shipping all that meat, I’d wager it’s not cheaper than growing plants for humans to eat)
Also, we farmed animals in the past because they are a good storage for calories when it’s winter and you can’t grow food. We live in a global society now. It’s not necessary. Animals are grown and killed because their meat is pleasurable to eat; simple as that.
Craigslist or Marketplace. Get a 90s mountain bike in your size. Start riding. Join a cycling club/social group. People are always changing bikes, and would be happy to let an older one go for a decent price.
It CAN be an expensive hobby, but it doesn’t have to be. I’ve been riding my $200 Craigslist special for about 1200km this year and I haven’t spent a penny on it.
Bike co-ops exist too! Check your area