Olli Sahimaa

Dr. Olli Sahimaa

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Research Focus & Metrics

Academic Career Length

12Years (2015-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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25 May 2023 in Fashion and Textiles
Verified
Journal Article
Open access
PDF file
TDTulin Dzhengiz
Tulin Dzhengiz
THTeresa Haukkala
Teresa Haukkala
OSOlli Sahimaa
Olli Sahimaa
Due to pressing sustainability challenges, the fashion industry is undergoing tremendous change. Surprisingly, even though the unique context of fashion presents an opportunity for scholars to explore the (un)sustainable transitions, this context has yet to receive the attention of transition scholars. Our article explores fashion transitions and develops a conceptual framework demonstrating this transition's multi-level and multi-dimensional interactions. We draw on three literature areas: multi-level perspective (MLP) of sustainable transitions, institutional logics and framing contests. We then introduce a conceptual framework and illustrative examples from the industry and demonstrate the tensions between positive and negative environmental and social sustainability developments at the niche, regime and landscape levels. We show that while many positive developments can be seen in the regime players through the adoption of corporate sustainability initiatives, new business models and collaborations, more attention should also be given to some adverse developments. Overall, we contribute to the literature by exploring fashion transitions, an under-explored context, and by demonstrating the complexity of interactions due to the diffusion of heterogeneous institutional logics and framing contests between players.

1 November 2021 in Waste Management
Verified
Journal Article
Open access
AUAino Ukkonen
Aino Ukkonen
OSOlli Sahimaa
Olli Sahimaa
Municipal solid waste is associated with different systemic challenges, such as climate change, resource scarcity, and ocean plastic pollution. European countries are striving towards more circular material use and the European Commission has advocated the use of economic incentives to boost recycling. The pay-as-you-throw (PAYT) scheme is an economic instrument that applies the 'polluter pays' principle by charging for waste according to the actual amount of generated waste. Volume-based PAYT fees have shown to be potentially less effective in waste prevention and recycling than weight-based fees. This paper illustrates how waste management operators can price residual waste with weight-based fees that encourage recycling, are fair with respect to service levels, and cover the current income for municipal waste operators. The result, obtained by forming equations satisfying the above conditions, is a model with a linear, discrete price function, where the price of the residual waste generated by the citizen is a function of the service level. This model encourages efficient source separation through internal subsidies, wherein a citizen can decrease the price of household waste by 32% if they increase the sorting efficiency from a default of 40% to 80% efficiency. The application of the model was illustrated in a case example. The model developed in this study can be used to implement weight-based PAYT schemes locally, thereby supporting the formulation of waste management systems that facilitate waste reduction and recycling.

1 December 2015 in Waste Management
Verified
Journal Article
Closed access
OSOlli Sahimaa
Olli Sahimaa
MHMari Hupponen
Mari Hupponen
MHMika Horttanainen
Mika Horttanainen
JSJaana Sorvari
Jaana Sorvari

15 December 2023 in Circular Economy and Sustainability
Verified
Journal Article
Open access
PDF file
OSOlli Sahimaa
Olli Sahimaa
EMElizabeth M. Miller
Elizabeth M. Miller
MHMinna Halme
Minna Halme
KNKirsi Niinimäki
Kirsi Niinimäki
HTHannu Tanner
Hannu Tanner
MHMichael Hummel
Michael Hummel
The fast fashion industry is notorious for wicked environmental and social problems, such as exploitative resource use, high amounts of waste, excessive pollution, below-living wages and unsafe working conditions. Addressing these problems calls for a systemic view on the industry with the goal of minimising the intake of natural resources into the system as well as the output of waste. However, thus far, most solution attempts have turned out simplistic and insufficient to nudge the industry to more sustainable practices at scale. We examine the textile and fashion system at the three different levels—the product, industry and socio-ecological system levels—and show the inadequacy of the current sustainability-driven practices in the field. As an alternative, we propose systemic solutions, geared toward long material and product lifetimes, that have the potential to trigger adaptive responses throughout different actors in the system and across all three levels. These systemic solutions operationalise a circular value retention hierarchy coupled with a sufficiency-based consumption philosophy.

17 February 2023 in Nature Reviews Earth & Environment
Verified
Journal Article
Closed access
PDF file
OSOlli Sahimaa
Olli Sahimaa
EMElizabeth M. Miller
Elizabeth M. Miller
MHMinna Halme
Minna Halme
KNKirsi Niinimäki
Kirsi Niinimäki
HTHannu Tanner
Hannu Tanner
MHMichael Hummel
Michael Hummel

1 April 2017 in Sustainable Production and Consumption
Verified
Journal Article
Closed access
OSOlli Sahimaa
Olli Sahimaa
MMM.K. Mattinen
M.K. Mattinen
SKS. Koskela
S. Koskela
MSM. Salo
M. Salo
JSJ. Sorvari
J. Sorvari
JSJ. Seppälä
J. Seppälä