Adding perspectives to: “Global trends in carbon dioxide (CO2) emissions from fuel combustion in marine fisheries from 1950 - 2016"

Friederike Ziegler*, Ole Ritzau Eigaard, Robert W.R. Parker, Peter H. Tyedmers, Erik Skontorp Hognes, Sepideh Jafarzadeh

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

A contribution in this issue, Greer et al. (2019), models carbon dioxide emissions from fuel combustion in global fisheries. This is done based on a method using data on fishing effort, presenting results for two sectors: small-scale and industrial fisheries. The selection of these sectors is not motivated in relation to studying fuel use, and it is well-documented that other factors more accurately predict fuel use of fisheries and would constitute a more useful basis for defining sub-sectors, when the goal of the study is to investigate fuel use. Weakly grounded assumptions made in the translation of fishing effort into carbon dioxide emissions (e.g. the engine run time per fishing day for each sector) systematically bias results towards overestimating fuel use of “industrial” vessels, underestimating that of “small-scale”. A sensitivity analysis should have been a minimum requirement for publication. To illustrate how the approach used by Greer et al. (2019) systematically misrepresents the fuel use and emissions of the two sectors, the model is applied to Australian and New Zealand rock lobster trap fisheries and compared to observed fuel use. It is demonstrated how the approach underestimates emissions of small-scale fisheries, while overestimating emissions of industrial fisheries. As global fisheries are dominated by industrial fisheries, the aggregate emission estimate is likely considerably overestimated. Effort-based approaches can be valuable to model fuel use of fisheries in data-poor situations, but should be seen as complementary to estimates based on direct data, which they can also help to validate. Whenever used, they should be based on transparent, science-based data and assumptions.
Original languageEnglish
Article number103488
JournalMarine Policy
Volume107
ISSN0308-597X
DOIs
Publication statusPublished - 2019

Keywords

  • Carbon dioxide
  • Fisheries
  • Fuel efficiency
  • Fuel intensity
  • Fuel use
  • Greenhouse gas emissions

Cite this

Ziegler, Friederike ; Eigaard, Ole Ritzau ; Parker, Robert W.R. ; Tyedmers, Peter H. ; Hognes, Erik Skontorp ; Jafarzadeh, Sepideh. / Adding perspectives to: “Global trends in carbon dioxide (CO2) emissions from fuel combustion in marine fisheries from 1950 - 2016". In: Marine Policy. 2019 ; Vol. 107.
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abstract = "A contribution in this issue, Greer et al. (2019), models carbon dioxide emissions from fuel combustion in global fisheries. This is done based on a method using data on fishing effort, presenting results for two sectors: small-scale and industrial fisheries. The selection of these sectors is not motivated in relation to studying fuel use, and it is well-documented that other factors more accurately predict fuel use of fisheries and would constitute a more useful basis for defining sub-sectors, when the goal of the study is to investigate fuel use. Weakly grounded assumptions made in the translation of fishing effort into carbon dioxide emissions (e.g. the engine run time per fishing day for each sector) systematically bias results towards overestimating fuel use of “industrial” vessels, underestimating that of “small-scale”. A sensitivity analysis should have been a minimum requirement for publication. To illustrate how the approach used by Greer et al. (2019) systematically misrepresents the fuel use and emissions of the two sectors, the model is applied to Australian and New Zealand rock lobster trap fisheries and compared to observed fuel use. It is demonstrated how the approach underestimates emissions of small-scale fisheries, while overestimating emissions of industrial fisheries. As global fisheries are dominated by industrial fisheries, the aggregate emission estimate is likely considerably overestimated. Effort-based approaches can be valuable to model fuel use of fisheries in data-poor situations, but should be seen as complementary to estimates based on direct data, which they can also help to validate. Whenever used, they should be based on transparent, science-based data and assumptions.",
keywords = "Carbon dioxide, Fisheries, Fuel efficiency, Fuel intensity, Fuel use, Greenhouse gas emissions",
author = "Friederike Ziegler and Eigaard, {Ole Ritzau} and Parker, {Robert W.R.} and Tyedmers, {Peter H.} and Hognes, {Erik Skontorp} and Sepideh Jafarzadeh",
year = "2019",
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language = "English",
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journal = "Marine Policy",
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Adding perspectives to: “Global trends in carbon dioxide (CO2) emissions from fuel combustion in marine fisheries from 1950 - 2016". / Ziegler, Friederike; Eigaard, Ole Ritzau; Parker, Robert W.R.; Tyedmers, Peter H.; Hognes, Erik Skontorp; Jafarzadeh, Sepideh.

In: Marine Policy, Vol. 107, 103488, 2019.

Research output: Contribution to journalJournal articleResearchpeer-review

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T1 - Adding perspectives to: “Global trends in carbon dioxide (CO2) emissions from fuel combustion in marine fisheries from 1950 - 2016"

AU - Ziegler, Friederike

AU - Eigaard, Ole Ritzau

AU - Parker, Robert W.R.

AU - Tyedmers, Peter H.

AU - Hognes, Erik Skontorp

AU - Jafarzadeh, Sepideh

PY - 2019

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KW - Fuel efficiency

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