Of sets of offsets: Cumulative impacts and strategies for compensatory restoration

Type Article
Date 2015-09
Language English
Author(s) Thebaud OlivierORCID1, 6, Boschetti Fabio2, 3, Jennings Sarah4, Smith Anthony D.M.5, Pascoe Sean1, 6
Affiliation(s) 1 : CSIRO Oceans & Atmosphere Flagship, Brisbane, Qld, Australia.
2 : IFREMER, UMR M101, AMURE, Unite Econ Maritime, Brest, France.
3 : Univ Western Australia, Perth, WA 6009, Australia.
4 : Univ Tasmania, Hobart, Tas, Australia.
5 : CSIRO Oceans & Atmosphere Flagship, Hobart, Tas, Australia.
6 : Queensland Univ Technol, Sch Econ & Finance, Brisbane, Qld 4001, Australia.
Source Ecological Modelling (0304-3800) (Elsevier Science Bv), 2015-09 , Vol. 312 , P. 114-124
DOI 10.1016/j.ecolmodel.2015.04.022
WOS© Times Cited 12
Keyword(s) Biodiversity offsets, Compensatory restoration, Cumulative impacts, Habitat-resource interactions, Bio-economic modelling, Social acceptability
Abstract Biodiversity offsets are increasingly advocated as a flexible approach to managing the ecological costs of economic development. Arguably, however, this remains an area where policy-making has run ahead of science. A growing number of studies identify limitations of offsets in achieving ecologically sustainable outcomes, pointing to ethical and implementation issues that may undermine their effectiveness. We develop a novel system dynamic modelling framework to analyze the no net loss objective of development and biodiversity offsets. The modelling framework considers a marine-based example, where resource abundance depends on a habitat that is affected by a sequence of development projects, and biodiversity offsets are understood as habitat restoration actions. The model is used to explore the implications of four alternative offset management strategies for a regulator, which differ in how net loss is measured, and whether and how the cumulative impacts of development are considered. Our results confirm that, when it comes to offsets as a conservation tool, the devil lies in the details. Approaches to determining the magnitude of offsets required, as well as their timing and allocation among multiple developers, can result in potentially complex and undesired sets of economic incentives, with direct impacts on the ability to meet the overall objective of ecologically sustainable development. The approach and insights are of direct interest to conservation policy design in a broad range of marine and coastal contexts.
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