The real problem is majority of crops being grown for animal agriculture, which is an extremely wasteful way of producing food. We'd only need a fraction of the farmlands if we were actually eating the crops we grow. Sadly, we can't count on consumers making rational choices and politicians are not going to tank their popularity by pushing for these changes. It's the same as climate change.
How we produce meat is an extremely wasteful way of producing food. Changing this would free up tons of farm ground, water and fertilizer.