For agriculture at least, the differences are often quite categorical. The best cast production will not get you the same differences as reducing meat consumption

Plant-based foods have a significantly smaller footprint on the environment than animal-based foods. Even the least sustainable vegetables and cereals cause less environmental harm than the lowest impact meat and dairy products [9].

www.mdpi.com/2072-6643/14/8/1614/html

It’s an even larger difference than eliminating all food waste (which we should also work to reduce)

we show that plant-based replacements for each of the major animal categories in the United States (beef, pork, dairy, poultry, and eggs) can produce twofold to 20-fold more nutritionally similar food per unit cropland. Replacing all animal-based items with plant-based replacement diets can add enough food to feed 350 million additional people, more than the expected benefits of eliminating all supply chain food loss.

www.pnas.org/doi/abs/10.1073/pnas.1713820115