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Department of Planning

PhD defence by Fredrik Moltu Johnsen

The development of a weighting method for use in life cycle assessments of amine based post-combustion carbon capture and storage (CCS) in the Arctic region


31.03.2017 kl. 12.30 - 15.30


The main aim of this article-based dissertation has been to quantify how to trade off, or weight, different environmental impacts in the context of life cycle assessment (LCA) studies. There has been a particular focus on environmental consequences in the Arctic region, and on the technological case of carbon capture and storage (CCS).

Weighting or valuation in LCA is regarded as a somewhat value-laden subject, which aims to summarize the diverse results of an environmental LCA study into one indicator. The project has suggested that the slowness of reversibility of damage to a safeguard subject can be regarded as an indicator of the value of the subject. This has been quantified into weighting factors by observation of the regeneration period of the safeguard subjects. This idea may, to some extent, serve to illuminate the concept of sustainability in general terms.

Preliminary LCA scaling factors have been suggested for the Arctic region, by means of a survey of expert on Arctic environment.

Based on a previous LCA study of CCS, results show that ecosystem damage is the most relevant aspect of environmental damage from carbon capture and storage, with global warming from greenhouse gas emissions as a key contributor. Weighted LCA results are sensitive to methodological assumptions, and the strengths and weaknesses of the chosen methodology will be discussed.


Associate Professor Søren Løkke, Department of Planning, Aalborg University (Main supervisor)

PhD Andreas Brekke, Østfoldforskning AS, Norway (Co-supervisor)

Defense Moderator

Associate Professor Massimo Pizzol, Department of Planning, Aalborg University

The Assessment Committee

Professor Finn Arler, Department of Planning, Aalborg University (Chair)

Professor Michael Zwicky Hauschild, Technical University of Denmark

PhD Serenella Sala, European Commission Joint Research Centre


After the defence Department of Planning will host a small reception at Skibbrogade 5, 1 floor. Please report your participation here no later han 27 March 2017


Free of charge


Department of Planning


Skibrogade 5, room C2/12

Registration Deadline

27.03.2017 kl. 12.00

Register at