lower "per area", but organic farming always required 65 to 200% more field area than non-organic farming. The numbers were highest for bread wheat (200+ % more) and potatoes (160% more).Determining the environmental burdens and resource use in the production of agricultural and horticultural commodities. - IS0205 , Williams, A.G. et al., Cranfield University, U.K., August 2006. Svensk mat- och miljöinformation. Pages 4-6, 29 and 84-85. As of 2020 it seems that organic agriculture can help in mitigating climate change but only if used in certain ways. Yield from organic farming is significantly lower than that from conventional farming, ranging between 40% and 85% of the latter. The premiums on organic foods is also 150% higher than those from conventional farms, which is presented as an advantage for producers, partially compensating lower yield, but is at the same time a disadvantage for consumers. Environmental impact and emissions Researchers at Oxford University analysed 71 peer-reviewed studies and observed that organic products are sometimes worse for the environment. Organic milk, cereals, and pork generated higher greenhouse gas emissions per product than conventional ones but organic beef and olives had lower emissions in most studies. Usually organic products required less energy, but more land. Per unit of product, organic produce generates higher nitrogen leaching, nitrous oxide emissions, ammonia emissions, eutrophication, and acidification potential than conventionally grown produce. Other differences were not significant. The researchers concluded that public debate should consider various manners of employing conventional or organic farming, and not merely debate conventional farming as opposed to organic farming. They also sought to find specific solutions to specific circumstances. A 2018 review article in the Annual Review of Resource Economics found that organic agriculture is more polluting per unit of output and that widespread upscaling of organic agriculture would cause additional loss of natural habitats. Proponents of organic farming have claimed that organic agriculture emphasizes closed nutrient cycles, biodiversity, and effective soil management providing the capacity to mitigate and even reverse the effects of climate change and that organic agriculture can decrease fossil fuel emissions. "The carbon sequestration efficiency of organic systems in temperate climates is almost double () that of conventional treatment of soils, mainly owing to the use of grass clovers for feed and of cover crops in organic rotations." However, studies acknowledge organic systems require more acreage to produce the same yield as conventional farms. By converting to organic farms