Modelled estimates of the environmental impact of dietary choices often fail to reflect true dietary practice. This study links a dietary dataset from 55,000 UK consumers with food-level data on GHG emissions, land use, water use, eutrophication and biodiversity to compare the environmental burden of different levels of meat consumption.
Since you mentioned sustainable agriculture i suggest you to read the book “everything i want to do is illegal by joel salatin”. He is a pioneer on real substainable farming, but spoiler alert the government make his job super hard and really expensive because politics need to help the poor bilionaires that can’t afford the 3rd yacht