"Tofu has been crowned the prince of protein by a scientific scoring system that measured human health, sustainability and affordability.
...
To assess the environmental impact of each food, MacDonald compared the greenhouse gas emissions, water pollution, land use and water use involved in producing 100g (3.5oz) of protein from each food.
Tofu was judged the best in this category, followed by chia seeds, quinoa, beans and sunflower seeds. Meanwhile, pork, beef and cheddar cheese came last."
https://www.sciencefocus.com/news/best-source-protein-tofu