This industry is happy to let manure runoff into local ecosystems and lead to massive waterway pollution and toxic algae blooms. Biogas is no better with the tanks used for holding manure for biogas regularly leaking out and/or overflow

This is not an industry that is super concerned about fertilizer shortages and usage. Animal agriculture makes fertilizer demand increase and worsens the problem, even if manure was used 100% optimally

Thus, shifting from animal to plant sources of protein can substantially reduce fertilizer requirements, even with maximal use of animal manure

https://www.sciencedirect.com/science/article/abs/pii/S0921344922006528

For an example of how large the fertilizer difference can be: Producing 1kg protein from beans uses 12x less fertilizer than doing the same from beef

To produce 1 kg of protein from kidney beans required approximately eighteen times less land, ten times less water, nine times less fuel, twelve times less fertilizer and ten times less pesticide in comparison to producing 1 kg of protein from beef

https://pubmed.ncbi.nlm.nih.gov/25374332/