Why didn't farming pollute the environment so much before, but modern farming is very polluted?

A village with less than 100 households has 1 cattle farm, 2 domestic sheep farms, 2 pig farms, 5 duck sheds and 7 chicken coops within one kilometer of Fiona Fang, and the stock of livestock and poultry is as high as hundreds of thousands. All kinds of feces are piled up nearby without treatment, and sewage directly flows into the river ditch next to the village. Especially after entering the summer, the village stinks and breeds a large number of mosquitoes and flies, which seriously affects the normal life of the villagers. It's a pity that we all belong to the same village, and we can't say it even though we complain.

The county issued a notice that the farms (sheds) outside the village 1000 meters were dismantled and moved out within 15 days. Not only will it be demolished and moved out within a time limit, but there will be no relevant subsidies for illegally built farms (sheds). Except for 1 cattle farm and 1 sheep farm, these farms (sheds) at the village head are all illegally built. This matter has become a hot topic in the village, and most villagers have expressed their support. Finally, they don't have to endure stench and mosquitoes and flies. However, farmers are full of helplessness and tears, their income is suddenly interrupted, and even they have to pay a lot of money!

Farming pollution has always been an objective problem, but in the past, the relatively scattered pollution in rural farming was not obvious, but now it is all large-scale farming, and the pollution caused by improper manure treatment is very obvious. However, most farmers know that large-scale farming cannot be carried out within the village 1000 meters, but they still illegally build farms for convenience; Knowing that feces are seriously polluted, they are still discharged at will to save trouble. It can be said that these farms of the village head are not disgusted, and even welcome.

However, everything has two sides, and it is not easy for farmers. They should be given a chance to live. If you can't find a new breeding place within the time limit, farmers will lose a lot of money, or even lose everything. Illegal farms should be restricted to give farmers enough time to find new farms or stop raising them after they are released. At the same time, areas where conditions permit should set aside concentrated areas for farmers to use.