Waste A Lot, Want A Lot More

why reducing food losses should be prioritized over boosting production

Increasing food production to meet the demands of a growing population and amidst the impact of climate events has been highly prioritized on the development agenda. Yet up to one third of the food currently produced globally is either lost or wasted. It may be the case that the best practice to ensure food security and avoid further environmental degradation would be to improve the existing food system by minimizing food loss and waste.

 

Food lost in Africa each year can feed up to 300 million people

It is predicted that by 2050 the world will have an additional 2.3 billion people. The vast majority of this population growth is expected to occur in the developing world, particularly in Sub-Saharan Africa (FAO, 2009). The current trend of Sub-Saharan economies growing at a faster rate than many high-income countries is also expected to continue well into 2050. As a result of this population and economic growth, alongside the threat of climate change, boosting food production has remained a priority (Larson, 2014).

Calls for increasing cereal production, both for human consumption and animal feed have been made, with demand projected to rise to one billion tonnes by 2050 (FAO, 2009). The demand for other products such as livestock, dairy and vegetable oils are expected to grow even faster than cereals, with meat production predicted to increase by 200million tonnes. All in all, the FAO has estimated that global food production would have to be up-scaled to produce 70% more food in order to meet the demands of the 9.1 billion world population expected by 2050. This would include a doubling of current food production in low and middle-income countries (LMICs).   However, the problem with this is that it would require considerably more land and water, which can have an exhausting and detrimental impact on the planet’s existing resources.

The growth of agricultural production, particularly meat and dairy can cause the further depletion and pollution of land, air and water resources; which can lead to an exacerbation of the already erratic climatic conditions. For instance, meat and dairy are very resource-intensive commodities. The livestock sector occupies 45% of the global surface area and is responsible for 8% of global human water use (Thornton et al. 2011; Joyce et al. 2012). Approximately 13 million hectares of global rainforests were cleared each year between 2000 and 2010 to make space for agricultural activities, particularly mono-crop farming and animal grazing (UN, 2012). Deforestation is one of the leading causes of carbon dioxide emissions. In total, agriculture is responsible for approximately 22% of global greenhouse gas emissions (more than the transport sector) including methane and nitrous oxide, which have a greater warming effect than carbon dioxide (McMichael et al. 2007). Thus, increasing food production in light of the impact of global warming can actually lead to further climatic changes. With regards to water, scientists at the Stockholm International Water Institute (SIWI) have predicted that by 2050 there will be insufficient water to maintain the level of intensive agricultural practices needed to meet the requirements of this future population (Jägerskog et al. 2012).

Parallel to the forecasted increase in demand for food commodities and need to boost production, is the amount of food that is currently lost or wasted. In short, food waste occurs primarily at the consumer level, where food is discarded by supermarkets and households or left to expire due to negligence. Food loss however, is defined as the “decrease in quantity or quality of food”, and usually occurs at the production end due to poor post-harvest techniques and a lack of infrastructure such as road networks (FAO, 2014). Globally, approximately 30% of annual cereal production is lost or wasted, (which totaled 2.3 billion tonnes in 2009/2010); along with 20% of the meat and dairy produced (FAO). Fruits, vegetables and tubers constitute the largest portion of wasted food at 45% (FAO).  Every year, LMICs are estimated to lose or waste in excess of 630 million tonnes of food; which is almost on par with high income countries at 670 million tonnes (FAO). This has been calculated to cost LMICs approximately US$310 billion (FAO). The Food and Agriculture Organization (FAO) estimates that the food lost in Africa alone can feed up to 300 million people; and if only a quarter of the food wasted globally was to be saved it could feed 870 million people, which is nearly all of the undernourished people in the world.

Food waste exists mainly in high-income countries, while the majority of food loss is found in poorer countries. However, with the current nutrition transition in many LMICs, food waste is expected to become more of a problem. Currently consumers in Sub-Saharan Africa were estimated to waste 6-11kg of food per year compared to 95-115kg in North America and Europe; however this is likely to increase due to a rise in supermarket chains, rapid urbanization, and diet and lifestyle changes.

Food lost at the post-harvest and processing stages of production in LMICs has been calculated at around 40% (FAO). This occurs largely as a result of financial and technical constraints, including a lack of adequate storage facilities. Thus, providing support to farmers in terms of post-harvest infrastructure such as cold storage, packaging and transportation could go a long way towards mitigating food loss. Professor Judith Kimiywe from the Department of Food, Nutrition and Dietetics at Kenyatta University in Kenya stated at the 2014 ANEC Conference in Ghana that 40% of all food loss in Africa was due to poor road networks*.

Strategies to reducing food loss in LMICs can be as straightforward as prioritizing investment in the necessary infrastructure, reducing transport distances by providing sales points closer to farmers and improving access to simple, low-cost post-harvest technologies such as plastic bags** and chlorination;*** all of which can have a significant impact on reducing food loss. Also, farmers can benefit from post-harvest handling and food management training as well as the improvement of market access and the provision of market requirement information (IRIN, 2014).

The need to reduce food losses and waste goes beyond increasing availability; as it results in the unnecessary depletion of land and water resources, not to mention energy, labour and capital (FAO, 2014). This environmental impact varies according to the level of processing and the stage in the supply chain at which food is lost. Also, small-scale farmers and poor consumers in LMICs tend to feel the brunt of food losses as it translates into a loss of income for farmers and higher food prices for consumers – thus contributing to hunger and food and nutrition insecurity. It is therefore recommended that reducing food loss and waste should be the first point of call for ensuring global food security for the future population of the world.

* for a digest of the 2014 ANEC conference email keiron.audain@gmail.com 
** Storing in sealed plastic bags with cotton liners; the cotton prevents emerging insects from perforating the plastic bag
*** The purpose of chlorination is to drastically reduce the number of microorganisms in the water and thus reduce or prevent inoculation with post-harvest diseases or contamination with human pathogens

 

Further Reading:

Reducing Food Losses in Sub-Saharan Africa

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Livestock depletes and pollutes global water sources – Happy #WorldWaterDay

Water is essential for the continuation of life as we know it, yet over the years it has become dangerously depleted and polluted. This post briefly highlights the impact commercial livestock farming has on the world’s water sources.

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While it is said that the average person uses between 30 and 300 litres of water a day 1, it takes up to 3000 litres of water to produce the food  in their daily diet, particularly meat and dairy.

Commercial livestock farming uses over 8% of global water, of which almost 90% is used to produce animal feed 1. Sadly, the vast majority of this animal feed is produced in areas that are already facing considerable water scarcity. Approximately 38% of the world’s population live in water stressed areas and it is predicted that by 2025 this will rise to 64% 1. By 2023, roughly 33% or 1.8 billion people will be living in water-scarce areas such as South Africa, India, China and Pakistan 1. Predictions such as these will have disastrous consequences on the food system, as it was already estimated that close to 350 million tonnes of food was lost to water depletion in 2012 4.

The concept of “virtual water” refers to the total volume of water needed to produce a  commodity or provide a  service 2. Animal products have a higher virtual water content than plant products, as the living animal needs drinking water, service water, and as mentioned before, the water needed to produce animal feed 2. Based on this concept, it is estimated that 200 litres of water is used to produce just 200ml of milk; 135 litres of water is used to produce one 40g egg; and 2400 litres of water is used to produce one hamburger patty weighing 150g 2.

The use of virtual water is not always monitored in terms of where the commodity is produced but rather where it is consumed. For example, the 90% of virtual water used for producing animal-based commodities in Japan actually comes from imported animal feed  2.|Thus it is  actually countries outside of Japan that shoulder the majority of water depletion necessary to meet the Japanese demand for animal products.

Apart from depleting water sources, livestock is also heavily involved in polluting them. Animal manure used as fertiliser is very nitrogen-rich and the excess remaining after plant uptake can saturate soils and contaminate surface and groundwater sources via leaching and soil runoff 5. Nitrogen then accumulates in water bodies such as lakes, rivers and oceans, and encourages the growth of oxygen-consuming algae. This leaves less oxygen available for aquatic life, a process known as eutrophication 5. It is estimated that livestock adds 32% of the nitrogen load and 33% of the phosphorus load into fresh water sources 1.

Algae overgrowth due to Eutrophication

Algae overgrowth due to Eutrophication

A significant amount of pollution occurs by way of antibiotics, pesticides and heavy metals 5, 6. The amount of antibiotics used in the livestock industry worldwide has also not been quantified due to the heavy reliance on estimated international data 6. Antibiotic use in livestock has been banned in the EU; however, approximately 11,200 metric tons are used each year by livestock producers in the US to promote animal growth 6. This may be contributing to the growing number of antibiotic-resistant bacteria circulating within the human population, for example Aeromonas spp, which was identified in human drinking water in the US from as early as the 1980s 6. Antibiotics can even be absorbed by certain crops, as once observed in carrots, corn and lettuce 7.

The sobering conclusion of the state of the world’s water is that the impact will only felt as the situation gets worse;  making it more difficult to implement improvement strategies, especially in poverty-stricken areas 7. Scientists at the Stockholm International Water Institute (SIWI) predicted that by 2050 there will be not be enough water to maintain the intense animal farming needed to feed an expected population of 9 billion 8. To avoid this, intervention is needed to reduce animal-based calorie intake from current levels of 20% to just 5%, as well as to improve water usage within the sector 8.

 

References

  1. Steinfeld H, Gerber P, Wassenaar T et al. (2006) Livestock’s Long Shadow: Environmental issues and options. FAO/LEAD, Rome, Italy.
  2. Chapagain AK & Hoekstra AY (2004) Water Footprints of Nations – volume 1: Main Report; Value of Water Research Report Series No. 16. UNESCO-IHE; http://www.waterfootprint.org
  3. Turner K, Georgiou S, Clark R, Brouwer R, Burke J. 2004. Economic Valuation of Water Resources in Agriculture, from the Sectoral to a Functional Perspective of Natural Resource management; FAO paper reports No. 27. Food and Agriculture Organization of the United Nations
  4. FAOSTAT (2013) Statistics Division of the Food and Agriculture Organisation of the United Nations. Available: http://faostat.fao.org/site/291/default.aspx
  5. Martinez J, Dabert P, Barrington S, et al. (2009) Livestock Waste Treatment Systems for Environmental Quality, Food Safety, and Sustainability. Bioresource Technology; 100; 5527–5536
  6. Kümmerer, K (2009a) Antibiotics in the Aquatic Environment – A Review – Part I. Chemosphere; 75; 417–434
  7. Kümmerer, K (2009b) Antibiotics in the Aquatic Environment – A Review – Part II. Chemosphere; 75; 435–441
  8. Jägerskog A., Jønch Clausen T (2012) Feeding a Thirsty World – Challenges and Opportunities for a Water and Food Secure Future. Report (eds.) Nr. 31. SIWI, Stockholm.