Renewability and emergy footprint at different spatial scales for innovative food systems in Europe

Christina Wright, Hanne Østergård

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Food production is increasingly being challenged by limited resources of energy and land as well as bygrowing demand for food. In a future with less availability of fossil fuels, land area will become veryimportant for capturing the flow-limited renewable resources. Emergy assessment has been applied tocalculate scale dependent indicators, which account for the land area needed, if agricultural systems wereto be supported solely on renewable sources. These indicators are designated emergy footprints (EmFs)and expand the concept of support area defined previously in emergy accounting. The EmF (in ha) iscalculated based on renewable empower densities which convert resource use into area equivalents ableto capture renewable flows. The spatial division between on-site, local and non-local land areas appliedin this study, identifies where the support area is located in order to apply a site-specific renewableempower density. A new indicator applying the EmF is the emergy overshoot factor, which estimatesthe ratio between EmF and the geographical system boundary (in ha). We apply this approach on threeinnovative food supply systems in Europe located at farms characterised by combining high diversity,reduced use of resources, nutrient cycling and local sales. The question is whether this type of food systemmay be considered sustainable from a resource use point of view measured as resource use efficiencyby means of unit emergy value (UEV), renewability (Ron-siteand Rglobal), direct and indirect occupationof land on different spatial scales (EmF and Emergy overshoot factor) and productivity per ha of thedirectly observed areas and the EmF area, respectively. Labour inputs constituted between 13 and 80 % ofthe total emergy flow. The proportion of resource use from renewable sources was between 31 and 60% when excluding the inputs of direct labour. The food system with the lowest UEV, excluding direct labour,had the highest emergy overshoot factor, which even exceeded the global average of seven. However,this system had the highest productivity. The system with the highest UEV, excluding direct labour, hadthe lowest overshoot factor. In conclusion, each food system strategy has its pros and cons and it dependson the priorities, which is judged the most sustainable from an emergy point of view.© 2015 Elsevier Ltd. All rights reserved.
Original languageEnglish
JournalEcological Indicators
Volume62
Pages (from-to)220–227
ISSN1470-160X
DOIs
Publication statusPublished - 2016

Keywords

  • Low-input agriculture
  • Renewability
  • Food supply system
  • Emergy footprint
  • Renewable empower density
  • Overshoot

Cite this

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title = "Renewability and emergy footprint at different spatial scales for innovative food systems in Europe",
abstract = "Food production is increasingly being challenged by limited resources of energy and land as well as bygrowing demand for food. In a future with less availability of fossil fuels, land area will become veryimportant for capturing the flow-limited renewable resources. Emergy assessment has been applied tocalculate scale dependent indicators, which account for the land area needed, if agricultural systems wereto be supported solely on renewable sources. These indicators are designated emergy footprints (EmFs)and expand the concept of support area defined previously in emergy accounting. The EmF (in ha) iscalculated based on renewable empower densities which convert resource use into area equivalents ableto capture renewable flows. The spatial division between on-site, local and non-local land areas appliedin this study, identifies where the support area is located in order to apply a site-specific renewableempower density. A new indicator applying the EmF is the emergy overshoot factor, which estimatesthe ratio between EmF and the geographical system boundary (in ha). We apply this approach on threeinnovative food supply systems in Europe located at farms characterised by combining high diversity,reduced use of resources, nutrient cycling and local sales. The question is whether this type of food systemmay be considered sustainable from a resource use point of view measured as resource use efficiencyby means of unit emergy value (UEV), renewability (Ron-siteand Rglobal), direct and indirect occupationof land on different spatial scales (EmF and Emergy overshoot factor) and productivity per ha of thedirectly observed areas and the EmF area, respectively. Labour inputs constituted between 13 and 80 {\%} ofthe total emergy flow. The proportion of resource use from renewable sources was between 31 and 60{\%} when excluding the inputs of direct labour. The food system with the lowest UEV, excluding direct labour,had the highest emergy overshoot factor, which even exceeded the global average of seven. However,this system had the highest productivity. The system with the highest UEV, excluding direct labour, hadthe lowest overshoot factor. In conclusion, each food system strategy has its pros and cons and it dependson the priorities, which is judged the most sustainable from an emergy point of view.{\circledC} 2015 Elsevier Ltd. All rights reserved.",
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Renewability and emergy footprint at different spatial scales for innovative food systems in Europe. / Wright, Christina; Østergård, Hanne.

In: Ecological Indicators, Vol. 62, 2016, p. 220–227.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Renewability and emergy footprint at different spatial scales for innovative food systems in Europe

AU - Wright, Christina

AU - Østergård, Hanne

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AB - Food production is increasingly being challenged by limited resources of energy and land as well as bygrowing demand for food. In a future with less availability of fossil fuels, land area will become veryimportant for capturing the flow-limited renewable resources. Emergy assessment has been applied tocalculate scale dependent indicators, which account for the land area needed, if agricultural systems wereto be supported solely on renewable sources. These indicators are designated emergy footprints (EmFs)and expand the concept of support area defined previously in emergy accounting. The EmF (in ha) iscalculated based on renewable empower densities which convert resource use into area equivalents ableto capture renewable flows. The spatial division between on-site, local and non-local land areas appliedin this study, identifies where the support area is located in order to apply a site-specific renewableempower density. A new indicator applying the EmF is the emergy overshoot factor, which estimatesthe ratio between EmF and the geographical system boundary (in ha). We apply this approach on threeinnovative food supply systems in Europe located at farms characterised by combining high diversity,reduced use of resources, nutrient cycling and local sales. The question is whether this type of food systemmay be considered sustainable from a resource use point of view measured as resource use efficiencyby means of unit emergy value (UEV), renewability (Ron-siteand Rglobal), direct and indirect occupationof land on different spatial scales (EmF and Emergy overshoot factor) and productivity per ha of thedirectly observed areas and the EmF area, respectively. Labour inputs constituted between 13 and 80 % ofthe total emergy flow. The proportion of resource use from renewable sources was between 31 and 60% when excluding the inputs of direct labour. The food system with the lowest UEV, excluding direct labour,had the highest emergy overshoot factor, which even exceeded the global average of seven. However,this system had the highest productivity. The system with the highest UEV, excluding direct labour, hadthe lowest overshoot factor. In conclusion, each food system strategy has its pros and cons and it dependson the priorities, which is judged the most sustainable from an emergy point of view.© 2015 Elsevier Ltd. All rights reserved.

KW - Low-input agriculture

KW - Renewability

KW - Food supply system

KW - Emergy footprint

KW - Renewable empower density

KW - Overshoot

U2 - 10.1016/j.ecolind.2015.10.042

DO - 10.1016/j.ecolind.2015.10.042

M3 - Journal article

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EP - 227

JO - Ecological Indicators

JF - Ecological Indicators

SN - 1470-160X

ER -