Is fertilizer runoff a non-issue? I guess if I'm putting my point together I'm trying to say "we can figure out how to grow crops without this much cow waste".

Is fertilizer runoff a non-issue? I guess if I'm putting my point together I'm trying to say "we can figure out how to grow crops without this much cow waste". If in 30 years meat consumption goes down dramatically, I'm very skeptical that we'll be growing feed corn to feed cows we dont eat, then use their waste to grow other plants.