En-en adult card 8 agriculture

Card #8: Agriculture

Causes		Consequences
Human activities		Deforestation Other GHGs

Agriculture does not emit a lot of CO₂, but is responsible for the emission of large quantities of methane
(from cows and rice paddies) and of nitrous oxide (from fertilizers).
In all, agriculture amounts for 25% of GHGs if we include induced deforestation.

Explanation

Agriculture uses very little fossil energy, compared to the emissions of other GHGs for which it is responsible. It is responsible for 80% of deforestation. Indeed, large areas are needed to grow crops, especially to feed farm animals. Agriculture is a human activity that began as soon as the climate stabilised, at the beginning of the Neolithic period 10,000 years ago, after the last deglaciation, which itself lasted 10,000 years. Since then, the impact of human activity on its environment has been growing: it has domesticated plant species (today, domesticated rice is no longer able to reproduce without human intervention), it has deforested to expand the cultivated areas, depriving animal species of their natural habitat, and since the Green Revolution (green for agricultural, not for ecological!), it has begun to use pesticides and inputs that are harmful to the environment and to itself.

Facilitation tips

Facilitation tips (to be amended)

Other possible links

Consequences

• Carbon Sinks It doesn't matter if this link is not made, but it is true that agriculture can improve storage capacity through photosynthesis. This is the 0.4 per cent principle (if we increased the soil's capacity to sequester carbon by even 4/1000, we would have a significant impact on CO2).
• Terrestrial Biodiversity Here, we are thinking mainly of pesticides (especially round-up or neonicotinoids). No link with the climate, but an interesting relation to make.

To go further

Footprint of animal husbandry

Much of the impact of agriculture is due to animal husbandry. However, it is very difficult to have a percentage of greenhouse gases that is agreed due to many factors:

• Which Global warming potential (GWP) to choose: methane is the main warming gas due to livestock farming. If we look at a 20-year horizon, it has a GWP of 84, but of 28 only over a 100-year horizon: a difference of a factor of three.
• Partnerships with various private institutions who have a vested interest in this number, such as :
  • The European Feed Manufacturers' Federation (FEFAC)
  • the European Vegetable Oil and Proteinmeal Industry (FEDIOL)
  • the International Dairy Federation, (IDF)
  • the International Meat Secretariat (IMS)
  • the International Egg Commission (IEC)
  • the International Poultry Council (IPC)
  • the International Federation for Animal Health (IFAH)
  • the World Wildlife Fund (WWF).

At the end of the day, the two numbers most often found are:

• 18% of total emissions according to the 2007 report
• 14.5% of total emissions according to the 2012 report

Key concepts

• The IPCC distribution key logically assigns to industry the agro-industry (fertilisers, crop treatment products, herbicides, agricultural machinery) and the agro-food industry. But this does not help to estimate the positive effects that a system based on agroforestry, shorter distribution channels and a sharp drop in the consumption of industrially processed food products could have.
• The massive use of chemical fertilisers and pesticides gradually, but certainly, destroys the micro-flora and micro-fauna of the soil.
• Earthworms are disappearing, whereas they are real small ploughmen favouring root penetration and improving the permeability of the soil and the renewal of the water tables. On the other hand, they feed on the residues of previous crops and transform them into humus, a stable form of organic matter and a real sponge capable of storing a large quantity of water and releasing it in times of drought. Moreover, humus stores the mineral elements that can be used by the plant.
• Fungi also disappear under the effect of fertilisers and chemical treatment products, although they are intermediaries living in symbiosis with the plants. They act as an extension of the roots, fetching water and mineral salts and exchanging them for organic molecules produced by the plant.

Storing carbon through agroforestry

The disappearance of earthworms and fungi, as well as deep and frequent ploughing and the nakedness of the land between two crops over a long period of time, accelerate the decomposition of organic matter. Agricultural soils in chemical-input agriculture are net producers of carbon and regularly deplete organic matter. While agroforestry provides an annual increase of 4‰ (4 per 1000) in the level of organic matter in the soil. The soil then becomes a carbon sink.

Widespread use of these techniques would make agriculture the safest and cheapest carbon sink at very low or zero cost. It would provide a much healthier diet and would maintain and even develop a peasantry, the basis of food autonomy in many countries. Biodiversity would be greatly enhanced as a result. The shortening of circuits would reduce energy consumption. The same applies to a decline in the agri-food industry, which would also improve the health of our fellow citizens. A major source of pollution would disappear.

The jobs lost in agribusiness and agro-industry would be largely offset by those generated by agroforestry, which is much more labour-intensive than chemical-input agriculture.

At the same time, a significant reduction in meat consumption would sharply reduce the areas devoted to the production of cereals for animal feed (mainly cattle, pigs and poultry). This would compensate for the lower crop yields in the absence of chemical inputs.

In total, we would have :

• much healthier food produced by farmers who are proud of their work,,
• a healthier population (reduction in particular of cardiovascular diseases and cancers) as a result of eating less meat and food that does not contain chemical residues,
• soils becoming an important carbon sink by increasing the level of organic matter in the soil (4‰/year),
• a shift from industrial jobs (agrochemicals, agricultural machinery, agri-foodstuffs) to agricultural jobs,
• a reduction in food packaging,s,
• a strong decrease in energy consumption by the whole sector,,
• a decrease in methane production by reducing the number of ruminants,
• the disappearance of nitrous oxide production linked to nitrogen fertilizers,
• a boost to Terrestrial and Marine Biodiversity (disappearance of green algae and the ecological imbalance of which they are a symptom).