This chapter aims to provide an overview of research into quantifying the economic impacts of marine litter. From an environmental economics perspective it introduces the difficulties in measuring the economic costs of marine litter; reviews those sectors where these costs are notable; and considers policy instruments, which can reduce these costs. Marine litter is underpinned by dynamic and complex processes, the drivers and impacts of which are multi-scalar, transboundary, and play out in both marine and terrestrial environments. These impacts include economic costs to expenditure, welfare and lost revenue. In most cases, these are not borne by the producers or the polluters. In industries such as fisheries and tourism the costs of marine litter are beginning to be quantified and are considerable. In other areas such as impacts on human health, or more intangible costs related to reduced ecosystem services, more research is evidently needed. As the costs of marine litter are most often used to cover removing debris or recovering from the damage which they have caused, this expenditure represents treatment rather than cure, and although probably cheaper than inaction do not present a strategy for cost reduction. Economic instruments, such as taxes and charges addressing the drivers of waste, for instance those being developed for plastic bags, could be used to reduce the production of marine litter and minimise its impacts. In any case, there remain big gaps in our understanding of the harm caused by marine litter, which presents difficulties when attempting to both quantify its economic costs, and develop effective and efficient instruments to reduce them.

Abstract:One approach to reducing the environmental costs of economic activity is to design and implement policies that aim at decoupling economic activity from its environmental impacts. Such a decoupling requires an economy-wide approach to policy-making, through broad mixes of policy instruments that create the right framework conditions for decoupling, and which provide coherent and consistent signals to resource-using sectors of the economy. This article summarizes the ex ante qualitative environmental assessment of three policy mixes (over-arching, metals, and land use) developed within the DYNAMIX project, highlighting their potential impacts on raw material extraction, greenhouse gas emissions, land use, freshwater use, and biodiversity (parallel assessments addressed economic and social impacts, and governance issues). Whilst the environmental assessments largely identified positive impacts, some policies had potential for minor negative impacts. The key challenges for undertaking such an assessment are identified (including uncertainty, baseline accuracy, the differing nature and scope of policies, policy flexibility, and the challenges of implementing volume control policies). Finally, some conclusions and lessons for policy-makers are presented, to contribute to the development of future policies and improve the reliability of future environmental assessments of policy mixes.

Abstract:In resource economics, decoupling from environmental impacts is assumed to be beneficial. However, the success of efforts to increase resource productivity should be placed within the context of the earth's resources and ecosystems as theoretically finite and contingent on a number of threshold values. Thus far relatively few analyses exist of policies which have successfully implemented strategies for decoupling within these limits. Through ex-post evaluation of a number of real world policy mixes from European Union member states, this paper further develops definitions of the concept of decoupling. Beyond absolute (and relative) decoupling, "absolute decoupling within limits" is proposed as an appropriate term for defining resource-productivity at any scale which respects the existing real world limits on resources and ecosystems and as such, contributes to meeting sustainability objectives. Policy mixes presented here cover a range of resources such as fish stocks, fertilizers, aggregates and fossil based materials (plastics). Policy mixes demonstrating absolute decoupling and at least one where absolute decoupling within limits has occurred, provide insights on developing resource efficiency policies in Europe and beyond.

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