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A Net Energy Analysis of the Global Agriculture, Aquaculture, Fishing and Forestry System

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  • Zeke Marshall

    (The University of Leeds)

  • Paul E. Brockway

    (The University of Leeds)

Abstract

The global agriculture, aquaculture, fishing and forestry (AAFF) energy system is subject to three unsustainable trends: (1) the approaching biophysical limits of AAFF; (2) the role of AAFF as a driver of environmental degradation; and (3) the long-term declining energy efficiency of AAFF due to growing dependence on fossil fuels. In response, we conduct a net energy analysis for the period 1971–2017 and review existing studies to investigate the global AAFF energy system and its vulnerability to the three unsustainable trends from an energetic perspective. We estimate the global AAFF system represents 27.9% of societies energy supply in 2017, with food energy representing 20.8% of societies total energy supply. We find that the net energy-return-on-investment (net EROI) of global AAFF increased from 2.87:1 in 1971 to 4.05:1 in 2017. We suggest that rising net EROI values are being fuelled in part by ‘depleting natures accumulated energy stocks’. We also find that the net energy balance of AAFF increased by 130% in this period, with at the same time a decrease in both the proportion of rural residents and also the proportion of the total population working in AAFF—which decreased from 19.8 to 10.3%. However, this comes at the cost of growing fossil fuel dependency which increased from 43.6 to 62.2%. Given the increasing probability of near-term fossil fuel scarcity, the growing impacts of climate change and environmental degradation, and the approaching biophysical limits of global AAFF, ‘Odum’s hoax’ is likely soon to be revealed.

Suggested Citation

  • Zeke Marshall & Paul E. Brockway, 2020. "A Net Energy Analysis of the Global Agriculture, Aquaculture, Fishing and Forestry System," Biophysical Economics and Resource Quality, Springer, vol. 5(2), pages 1-27, June.
    • Handle: RePEc:spr:bioerq:v:5:y:2020:i:2:d:10.1007_s41247-020-00074-3
    DOI: 10.1007/s41247-020-00074-3
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    Cited by:

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    2. Dunlap, J. & Schramski, J.R., 2024. "Energy-systems accounting in industrial-natural systems; An energy analysis of a managed forest ecosystem including food web biomass dynamics," Ecological Modelling, Elsevier, vol. 488(C).
    3. J. Dunlap & J. R. Schramski, 2024. "An Energy Analysis of Managed Forestry Systems: Accounting for Foregone Biomass as an Indicator of Ecosystem Impact Alongside Conventional Energy Metrics," Biophysical Economics and Resource Quality, Springer, vol. 9(3), pages 1-13, September.

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