Assessing all social, environmental, economic aspects related to an abandonment of the European livestock model is extremely complex even for livestock scientists and many side effects are almost impossible to predict. There are however, five clear consequences that could be considered as certain:

Europe will lose a circular bio-economy champion

In a global circular bio-economy, livestock has many valuable roles that would disappear in a world without livestock. By valorising food-chain by-products livestock contributes to a more efficient agriculture and to a rich cultural and creative society. The recycling or some say ‘upcycling’ of biomass from resources such as grass, straw and bran that are inedible for people is an important process. If not consumed by livestock, these residues and by-products could quickly become an environmental burden in themselves, as human demand for processed foods increases. The recycling of the animal’s hides or skins into leather also provides our societies with a beautiful and durable material with unique properties that serves the production of footwear, clothing, home furnishing, car seats and interiors, musical instruments, bookbinding and many more consumer products that have created and maintain cultural value of many European countries. In fact leather is probably the first circular economy product in history.

Livestock also regulate the ecological cycles, close the nutrient cycle and improve soil fertility and carbon sequestration by recycling and using manure as a bio resource and using grasslands not suitable for crops. In mixed crop and livestock areas, grasslands rotations also have the function of cutting off the cycle of crop pests allowing farmers to reduce the use of pesticides. In a world without livestock, the increased demand for plant-based production would result in an intensification of farm land use, an increase in the agricultural land needed for food production, loss in biodiversity and an abandonment of lands which are not fit for crops or protein productions like mountain regions for instance. (See also: Resource Efficiency Champions: Co-Products, an Essential Part of Animal Nutrition)

Rural Europe will be depleted 

Today livestock is a key component of rural Europe. Livestock are present in almost all regions across Europe in a wide diversity of production systems according to local economic, geographical and sociological contexts. The livestock sector contributes substantially to the European economy (€168 billion annually, 45% of the total agricultural activity), to the trade balance and creates employment for almost 30 million people. Without livestock the rural exodus will increase, creating additional pressure in our cities, and a greater disconnection with nature and with our cultural heritage.  Abandoned land would also result in increased forest fire risks in a context of global warming. 

The use and price of synthetic fertilisers will increase

The livestock sector is not only producing food but also a wide range of by-products, starting with manures and other effluents. Today, 40% of the world’s cultivated area are using organic fertilisers coming from livestock production. A world without livestock will therefore lead to an important increase of synthetic fertilisers use. This would result in an increased dependency of European farmers on fertiliser imports, endangering our food security. Today fertilisers already represent one third of the farmer’s costs, in a future which may see a higher price for fertilisers, producing crops may no longer be profitable without a global price increase.     

Fertiliser is only one symbolic example common to all types of farm animals. Many other less known by-products, such as cosmetic products, or bioenergy, from the livestock sector will be hard to replace without high environmental, economic and social cost.  

European food culture heritage will partly vanish 

A complete shift away from livestock production would present major challenges to meeting all populations’ nutritional needs. With no meat, cheese, eggs and fish in diets, the EU population would not receive enough of several different essential dietary nutrients from the foods they eat. A plant-only diet also would require individuals to eat more food and more daily calories to meet their nutritional needs because the available foods from plants are not as nutrient dense as foods from animals.

Eliminating livestock would increase deficiencies in calcium, vitamins A and B12 and some important fatty acids (from fish). The latter are important as they help to reduce cardiovascular disease and improve cognitive function and vision in infants. Animal food products are the only available, non-supplemental sources of some fatty acids and vitamin B12. 

Against this backdrop, meat alternatives produced by a concentrated number of businesses, and the production of the B12 Vitamin by the pharmaceutical industry would replace farmers and livestock industry in rural areas. 

The carbon footprint of our meals will not see a substantial decrease 

From a climate change perspective, a world without livestock would likely not be as some may expect. Without ruminants, the maintenance of our pastoral meadow and hedgerow landscapes would become extremely difficult. Forests would gain ground and become more susceptible to fire in the event of extreme temperatures. A study in the US on this issue by animal scientists Mary Beth Hall and Robin R. White, considered that the total removal of livestock in the US would represent only a drop of about 2.6 per cent of total US emissions when considering the main side consequence of livestock abandonment. Considering the diversity and the difference in farming models between Europe and the US, we can only presume that the gains would be even less in Europe. In addition, there is little evaluation of the carbon footprint of synthetic meat alternatives that might not be as good as first expected[ref][/ref]. 

In a 2017 statement from the Animal Task Force, Jean-Louis Peyraud a researcher at INRA said, “A world without livestock farming is just a short, medium and long-term utopia. It is time for us to come back to more realistic positions based on facts. Removing livestock farming would be an absolute nonsense for humanity. But it does not mean that we do not need to improve our way of rearing animals, to respect them, to offer them a decent life and make sure that their slaughter is done without pain nor stress. We have to continue research and innovate in order to reduce the negative impacts of livestock farming and increase the services it provides to our societies.” 

Sources:
https://www.pnas.org/content/114/48/E10301.full
https://www.futura-sciences.com/planete/actualites/rechauffement-climatique-viande-in-vitro-encore-pire-planete-vraie-75120/
http://pr.euractiv.com/pr/world-without-livestock-farming-makes-no-sense-humanitarian-economic-ecological-and-agronomic