New findings suggest that more intensive agriculture might be the “least bad” option for feeding the world while saving its species – provided use of such “land-efficient” systems prevents further conversion of wilderness to farmland.
“Our results suggest that high-yield farming could be harnessed to meet the growing demand for food without destroying more of the natural world,” said Andrew Balmford, Professor of Conservation Science from Cambridge’s Department of Zoology.
Agriculture that appears to be more eco-friendly but uses more land may actually have greater environmental costs per unit of food than “high-yield” farming that uses less land, a new study has found.
There is mounting evidence that the best way to meet rising food demand while conserving biodiversity is to wring as much food as sustainably possible from the land we do farm, so that more natural habitats can be “spared the plough”.
However, this involves intensive farming techniques thought to create disproportionate levels of pollution, water scarcity and soil erosion. Now, a study published today in the journal Nature Sustainability shows this is not necessarily the case.
Scientists have put together measures for some of the major “externalities” – such as greenhouse gas emission, fertiliser and water use – generated by high- and low-yield farming systems, and compared the environmental costs of producing a given amount of food in different ways.
Previous research compared these costs by land area. As high-yield farming needs less land to produce the same quantity of food, the study’s authors say this approach overestimates its environmental impact.
Their results from four major agricultural sectors suggest that, contrary to many people’s perceptions, more intensive agriculture that uses less land may also produce fewer pollutants, cause less soil loss and consume less water.
However, the team behind the study, led by scientists from the University of Cambridge, caution that if higher yields are simply used to increase profit or lower prices, they will only accelerate the extinction crisis we are already seeing.
“Agriculture is the most significant cause of biodiversity loss on the planet,” said study lead author Andrew Balmford, Professor of Conservation Science from Cambridge’s Department of Zoology. “Habitats are continuing to be cleared to make way for farmland, leaving ever less space for wildlife.”
“Our results suggest that high-yield farming could be harnessed to meet the growing demand for food without destroying more of the natural world. However, if we are to avert mass extinction it is vital that land-efficient agriculture is linked to more wilderness being spared the plough.”
Conservation expert and co-author Dr David Edwards, from the University of Sheffield, said: “Organic systems are often considered to be far more environmentally friendly than conventional farming, but our work suggested the opposite. By using more land to produce the same yield, organic may ultimately accrue larger environmental costs.”
The study authors say that high-yield farming must be combined with mechanisms that limit agricultural expansion if it is to have any environmental benefit. These could include strict land-use zoning and restructured rural subsidies.
“These results add to the evidence that sparing natural habitats by using high-yield farming to produce food is the least bad way forward,” added Balmford.
“Where agriculture is heavily subsidised, public payments could be contingent on higher food yields from land already being farmed, while other land is taken out of production and restored as natural habitat, for wildlife and carbon or floodwater storage.”