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 in the journal Nature Sustainability, by an international team of scientists, led by the University of Cambridge and including the University of Bristol’s Dr Taro Takahashi, shows this is not necessarily the case.

Scientists have put together measures for some of the major "externalities" – such as greenhouse gas emission 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, 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.

Andrew Balmford, Professor of Conservation Science from Cambridge's Department of Zoology and lead author, said: "Agriculture is the most significant cause of biodiversity loss on the planet. 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."

The study analysed information from hundreds of investigations into four vast food sectors, accounting for large percentages of the global output for each product: Asian paddy rice (90 per cent), European wheat (33 per cent), Latin American beef (23 per cent), and European dairy (53 per cent).

Examples of high-yield strategies include enhanced pasture systems and livestock breeds in beef production, use of chemical fertilizer on crops, and keeping dairy cows indoors for longer.

Dr Taro Takahashi, Senior Lecturer at Bristol Veterinary School, a member of the University's Cabot Institute for the Environment and a research scientist at Rothamsted Research, said: "These results challenge us to think again about what constitutes good agriculture.

"Now, our role as veterinary experts is to ensure that the livestock's quality of life will not be compromised in the process of intensification, so that environmentally friendly farming is also welfare friendly."

The scientists found data to be limited, and say more research is urgently needed on the environmental cost of different farming systems. Nevertheless, results suggest many high-yield systems are less ecologically damaging and, crucially, use much less land.

For example, in field trials, inorganic nitrogen boosted yields with little to no greenhouse gas "penalty" and lower water use per tonne of rice. Per tonne of beef, the team found greenhouse gas emissions could be halved in some systems where yields are boosted by adding trees to provide shade and forage for cattle.

The study authors say that high-yield farming must be combined with mechanisms that limit agricultural expansion if they are to have any environmental benefit. These could include strict land-use zoning and restructured rural subsidies.

Professor Balmford added: "These results add to the evidence that sparing natural habitats by using high-yield farming to produce food is the least bad way forward.

"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."

Paper:

'The environmental costs and benefits of high-yield farming' by Andrew Balmford,  David Edwards, Philip Garnsworthy, Andrew Whitmore, Taro Takahashi et al  in Nature Sustainability