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Food security is fundamental to life, but it is also the single most environmentally demanding aspect of our lives.

Much has now been written about planetary food security into the future and its likely environmental impacts. For our purposes it will suffice to present the reader with the key points that can be easily followed up by checking resources on the web to obtain more accurate and up-to-date statistics.

Impact of food on resource use
Environmental impact (including plant and animal extinction and land degradation) is related to resource use. The average Australian’s resource consumption related to food is: 30% of our emissions, 46% of our water use and 50% of our Ecological Footprint. We need to aim for low water; low materials; low or no chemicals; low energy (low carbon diet); and minimum impact on biodiversity. This is assisted by eating locally-produced food with a diet that is low in meat and dairy products.[1][4]

We need to aim for low water; low materials; low or no chemicals; low energy (low carbon diet); and minimum impact on biodiversity. This is assisted by eating locally-produced food with a diet that is low in meat and dairy products.

Global net primary productivity & land use
Of all plant matter produced on the planet (total net primary productivity) about 20% is now for human use (crops, pasture, timber etc.).

Agriculture                                                38%                57%
Arable land                                                11%                6%
Permanent pasture                                  26%              51%
Permanent crops                                      1%               0.04%
See [2]

Plant foods
Early domestication of plants was based largely on cereals: wheat in Europe, rice in Asia, maize in the Americas and sorghum in Africa. There are now about 3000 known food plants and, of these, about 150 are cultivated and traded. However, 90% of the human diet consists of about 15 species and only four of these – wheat, rice, corn and potatoes – make up over 60% of the world food supply.

Global poverty and food security
The United Nations Food and agriculture Organisation (FAO) estimates that the total number of chronically undernourished people in the world in 2001-2003 was 854 million.

The FAO estimates that by 2030 about 50% more food than was produced in 1998 will be needed to feed the world population. Agriculture is now planning for climate change with the expected inundation of coastal areas, changing of optimal crop growing regions due to altered rainfall and temperatures, as well as a redistribution of pests and diseases.

Helping out
Five principles for making ethical food choices: Transparency, we have the right to know how our food is produced; Fairness, producing food should not impose costs on others; Humanity, consider unnecessary suffering of animals; Social responsibility, workers are entitled to decent wages and working conditions; Environmental responsibility, use foods that have been produced with minimal impact on the environment; Needs, preserving life and health is more justified than other desires.

Food security in Australia
The Murray-Darling catchment is Australia’s ‘food basket’ as it produces 41% of the value of the country’s agricultural production and 71% of the nation’s total area of irrigated crops. Water shortages threaten both the food supply and the river ecosystem.

Food waste
At least 8% of food in Australia goes to waste. It is possible to use anaerobic digestion to recycle food wastes into energy and fertilizer thus contributing to the circular economy of nature, in which organic wastes
are recycled into food and energy resources, thereby maximising carbon sequestration and minimising greenhouse emissions and environmental pollution. These processes are still in the early stages of development.

Food transport & world trade
Globalisation has resulted in increased food trade. In 2005 global food exports, valued at about US$612 billion, increased by 5% over the previous year and over 66% of this consisted of transformed or processed products. Ease of distribution and relatively cheap transport means that transnational companies can source the cheapest products from around the world. This has lead, in 2006, to the origin of the term ‘food miles’ which relates to fossil-fuel energy use in sending highly processed, canned and packaged food over ever-increasing distances, often under refrigeration and with various additives and preservatives. It has been criticized for food uniformity, vulnerability to disruptions, standards, the effect on small farmers and a distancing of consumers from the source of their sustenance. In the US, the average food item travels 2500-4000 km. The first study in Australia was published by CERES, Melbourne, in July 2007. The total for all transport in a typical food basket (multiple items) of commonly available and popular foods was found to be 70,803 km. However, it is possible for products transported over long distances to be more energy efficient than the same product produced locally e.g. an out-of-season crop produced under glass in Australia may use more energy than the same long-distance food. ‘Food miles’ are only one component of the total proct resource use over its life cycle.

Sustainable agriculture
It is estimated that, in passing through the food chain of agribusiness, each calorie of food produced requires 10 calories of fossil fuel – fossil fuel energy. Use of technology in developed countries has greatly reduced the numbers of people involved in food production. Mainstream agriculture has now boosted “sustainable” practices that address: desertification; salination; sodification; eutrophication; risk of disease in monocultures (genetically identical crops); methane production by livestock; high fossil-fuel energy machinery; loss of arable land.

Though the monitoring of this situation has vastly improved over the last decade or two much needs to be done to increase food production while reducing its footprint by using land more efficiently, increasing cropping efficiency, changing diets, and reducing waste.[3]

Urban agriculture
Cities are often built on prime arable now covered with buildings and bitumen. The remaining open space offers opportunities for food production in home and community gardens, as street trees, green roofs, green walls, aquaponics & hydroponics. This urban “farming” not only provides sustenance but “greens” the concrete jungle and moderates the climate. It can be distributed through food exchanges, cooperatives, farmers markets and the like contributing to the local economy.

Advantages of growing food locally
Locally grown food can significantly reduce our individual Ecological Footprint because: potentially saves land and biodiversity; saves resources (water, energy, materials) embodied in agribusiness (cultivation, storage and refrigeration, transport, packaging, marketing, retail, infrastructure, administration) – any excess food can be distributed to those in need; reduces use of fertilisers and herbicides and GM organisms. Minimises waste. Means we are in control of all stages of production, distribution and consumption. This helps with any health concerns and the fact that there are no internationally agreed environmental and work standards.
We have control over the kinds of food you eat, hygiene (does not need to be fumigated, refrigerated, processed or packaged), chemical inputs and social justice issues relating to production, distribution and administration.
Locally-produced food is fresh and often tastier; growing it provides light exercise; awareness of natural cycles – seasonal cycle, biological cycle of birth, growth, maturation, death, decay and renewal; awareness of ecological processes; possibly a family or social activity encouraging children to eat healthy foods. Greater choice of varieties. Instant contact between grower and eater. (Horticultural therapy)

A sustainable diet – one that promotes health as well as having minimal environmental and social costs; this is no or low (preferably white) meat.

1. Remember: environmental degradation springs essentially from consumption of resources. If you are self-sufficient, you are making no demand on external resources
2. Be aware of the energy, materials, water, biodiversity and social costs of your garden activities
3. ENERGY – maximise the capture of the Sun’s energy by growing energy-rich and high yielding crops like pumpkins and potatoes.
MATERIALS – minimize use of materials and chemicals and use integrated pest management.
WATER – use water from a rainwater tank harvested from the roof.
BIODIVERSITY – integrate garden activities as far as possible with the surrounding environment, in particular, avoid weedy invasive plants
4. Propagate from your own plants (seed & cuttings) where possible; share seed and produce with neighbours; prepare for leaner times by preserving and storing in times of abundance (see specific growing suggestions)

1. Remember: environmental degradation springs essentially from consumption of resources. Be as aware as possible of the energy, materials, water, biodiversity and social costs of food production
2. Buy organic, Fair trade, be mindful of ‘food miles’, buy bulk, buy with minimum packaging

[1] ACF
[2] FAOSTAT for year 2003
[3] Foley, J.A. et al. 2011
[4] Spenecr & Cross,2009

Foley, J.A. et al. 2011. Solutions for a cultivated planet. Natre 478: 337-342
Cross, R. & Spencer, R. (2009). Sustainable Gardens. CSIRO Publishing: Collingwood

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