Threats from land use
agriculture
land-use constraints in UK
animal feed
Land-use Inefficiency
'Grazing and crops grown for animal feed combined represent 85% of the nation’s total agricultural land footprint ‑ at home and abroad' (WWF, Future of Feed, 2002)
production of animal feed inherinently inefficient
using arable land for animal feed results means fewer calories and protein reach human pop than if arable land use direct human consumption (WWF, Future of Feed, 2002)
In some cases, less than 15% of the plant proteins from feed crops are turned into animal proteins for human consumption and 85% are wasted (Aiking, 2011; Pimentel & Pimentel, 2003
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food waste (UK)
Climate change
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Global warming impact 2000-3600kg CO2-eq. t^-1
water pollution
soil
compaction
mega farms
erosion
carbon
'Almost 4 million hectares of soil are at risk of compaction in England and Wales, affecting soil fertility and our water resources, and increasing the risk of flooding'. (State of Environment Soil Report, 2019)
'UK soils currently store about 10 billion tonnes of carbon, roughly equal to 80 years of annual UK greenhouse gas emissions' (State of Environment Soil Report, 2019)
'Over 2 million hectares of soil are at risk of erosion in England and Wales' (State of Environment Soil Report, 2019)
An estimated 3.9 million hectares of agricultural land are at risk of compaction in England and Wales, this risk is highest on clay soils during wet periods. The estimated total cost of compaction is £472 million per year (figure 3), nearly 3 times greater than that of erosion, reflecting its greater presence in the landscape (The total costs of soil degradation in England and Wales) as cited in (State of Environment Soil Report, 2019) .
SOM
Intensive agriculture has caused arable soils to lose about 40 to 60% of their organic carbon (State of Environment Soil Report, 2019)
Erosion is regularly exceeding the rate of formation in many areas (ref 21) (State of the Environment soil report, 2019)
About 17% of arable soils in England and Wales show signs of erosion, although 40% are thought to be at risk (ref 12). (State of the Environment soil report, 2019)
Erosion is mainly confined to lighter arable soils on hillslopes and peats in upland areas (ref 12) (State of the Environment soil report, 2019)
Of the 3 identified types of soil erosion (water, wind and removal during harvest) in England and Wales, erosion by water is the most extensive. A bare slope can be eroded
up to 1,000 times faster than one covered in vegetation (ref 24)
Overgrazing by sheep and footpath use
In the uplands, overgrazing by sheep and footpath use expose the soil and are believed to cause 75% of the erosion (ref 25) (State of the Environment soil report, 2019)'
agricultural intensification link with soil erosion
'Agricultural intensification has led to an increase in erosion. As fields have been increasing in size, the length of hedgerows has been decreasing. This makes the soil more susceptible to wind and water erosion. Every year England and Wales loses 2.9 million tonnes of topsoil to erosion. The total annual cost of erosion in England and Wales is about £177 million a year (figure 3) (ref 12)' (State of the Environment soil report, 2019)'
Subsidy changes encouraged farmers to grow maize for biofuel. Since early 1990's, land to grow maize has tripled, having negative implications for soil erosion, because maize crop has shallow roots that do not support the soil, and the crops are harvested in late autumn (after which more likely to experience high rainfall during winter). 'Where maize is grown in UK, up to half of river sediment comes from maize fields'. (State of the Environment soil report, 2019)' (ref 12).
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contamination
est 300,000 hectares are contaminated in the UK (State of Environment Soil Report, 2019)
Regular harvesting of land will cause soil carbon content to decline due to decomposition of organic compounds, and being removed in crops or eroded (ref 59) (State of the Environment: Soils report, 2019)
agriculture largest sector responsible for water polution in England according to (Environmental Agency: State of the Environment - Water quality 2018)
agricultural land use change
Howden and Burt, 2013
WW2 ploughing and post war agri-intensification (Howden and Burt, 2013)
profound increases in nitrate concentrations in many freshwater systems in UK
future intensification clear threat to UK water security
negative impacts
Biodiversity
ecology of marine and freshwater ecosystems
transport of nitrogen to oceans
eutrophication
animal protein
production of animal proteins requires about 100 times more water than producing an equal amount of plant proteins (Pimentel & Pimentel, 2003)'
agricultural intensification
negative impact upon nocturnal insect populations and bat species
Of the nitrogen which enters inland surface waters in England and Wales, 60% originates from agricultural land while only 32% is contributed from sewage effluent
From - Hunt, D. T. E.; Dee, A. S.; Oakes, D. B.Updating the estimatesof the source apportionment of N to UK waters. Phase 2; DEFRAreport by WRc plc, 2004. Available at http://www.fwr.org/defrawqd/wqd0002.htm.
link between changes in nitrate concentration in ground and surface waters and changes inland use and land management
Burt, T. P.; Johnes, P. J. Managing water quality in agriculturalcatchments.T. I. Br. Geogr.1997,22(1), 61–68
megafarms
small farms displaced by large intensive farms
4000 farms closed between 2010 and 2016 (DEFRA)
3/4 of which were in the smallest category (< 20 hectares) (DEFRA)
family farms can\t compete with big farms
Increased land price and falling price of goods
big farms make more profit
economies of scale
neg consequences
pollution
larger scale and more disasterous
land inefficiency
animal agriculture
for every 100 calories we feed to animals, we get 40 calories from milk, 12 from chicken and just 3 from beef
Stevenson PJ. Industrial livestock production: the twin myths of efficiency and necessity. Compassion in world farming. 2015. https://www.ciwf.org.uk/media/7425974/industrial-livestock-production-the-twin-myths-of-efficiency-and-necessity.pdf (accessed 9 Dec 2021
conservation
biodiversity
UK wildlife areas (including National Parks)
conservation failings
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cities
production of plastic waste
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