Critics of organic agriculture have argued for years that organic agriculture is inefficient, requiring more land than conventional agriculture to yield the same amount of food. Proponents have countered that increasing research could reduce the yield gap, and organic agriculture generates environmental, health and socio-economic benefits that can’t be found with conventional farming.
Organic agriculture occupies only 1% of global agricultural land, making it a relatively untapped resource for one of the greatest challenges facing humanity: producing enough food for a population that could reach 10 billion by 2050, without the extensive deforestation and harm to the wider environment.
That’s the conclusion doctoral student Jonathan Wachter and John Reganold reached in reviewing 40 years of science and hundreds of scientific studies comparing the long term prospects of organic and conventional farming. The study, Organic Agriculture in the 21st Century, published in Nature Plants, is the first to compare organic and conventional agriculture across the four main metrics of sustainability identified by the US National Academy of Sciences: be productive, economically profitable, environmentally sound and socially just.
They found that although organic farming systems produce yields that average 10-20% less than conventional agriculture, they are more profitable and environmentally friendly. Historically, conventional agriculture has focused on increasing yields at the expense of the other three sustainability metrics. In addition, organic farming delivers equally or more nutritious foods that contain less or no pesticide residues, and provide greater social benefits than their conventional counterparts.
With organic agriculture, environmental costs tend to be lower and the benefits greater.
Biodiversity loss, environmental degradation and severe impacts on ecosystem services ~ which refer to nature’s support of wildlife habitat, crop pollination, soil health and other benefits ~ have not only accompanied conventional farming systems, but have often extended well beyond the boundaries of their fields, such as fertilizer run-off into rivers.
Organic farming can help to both feed the world and preserve bushland. In a study published this year, researchers modelled 500 food production scenarios to see if we can feed an estimated world population of 9.6 billion people in 2050 without expanding the area of farmland we already use. They found that enough food could be produced with lower-yielding organic farming, if people become vegetarians or eat a more plant-based diet with lower meat consumption.
The existing farmland can feed that many people if they are all vegan, a 94% success rate if they are vegetarian, 39% with a completely organic diet, and 15% with the Western-style diet based on meat. Realistically, we can’t expect everyone to forgo meat.
Organic isn’t the only sustainable option to conventional farming either. Other viable types of farming exist, such as integrated farming where you blend organic with conventional practices or grass-fed livestock systems.
How we farm for food has massive implications for biodiversity. A recent analysis of the International Union for Conservation of Nature’s Red List has found agriculture to be the second largest threat to, and killer of, global biodiversity.
Sales of organic foods and beverages are rapidly growing in the world, increasing almost five-fold between 1999 and 2013 to $72bn. This 2013 figure is projected to double by 2018. Organic food and beverage sales in 2015 represented almost 5% of US food and beverage sales, up from 0.8% in 1997. Australian sales are equally robust.
Scaling up organic agriculture with appropriate public policies and private investment is an important step for global food and ecosystem security. The challenge facing policymakers is to develop government policies that support conventional farmers converting to organic systems. For the private business sector, investing in organics offers a lot of entrepreneurial opportunities and is an area of budding growth that will likely continue for years to come.
In a time of increasing population growth, climate change and environmental degradation, we need agricultural systems that come with a more balanced portfolio of sustainability benefits. Organic farming is one of the healthiest and strongest sectors in agriculture today and will continue to grow and play a larger part in feeding the world. It produces adequate yields and better unites human health, environment and socio-economic objectives than conventional farming.
Repost ~ Can we feed 10 billion people on organic farming alone? | The Guardian Australia
Additional reading ~ Commentary: The ravages of guns, nets and bulldozers | Nature