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Plastic pollution has been documented across the Laurentian Great Lakes basin. Here, we demonstrate the application of a published ecological risk assessment and management framework for microplastics in aquatic environments by comparing proposed thresholds for risk to monitoring data from the Great Lakes region. Our results suggest that there may be measurable risks from microplastics to aquatic communities in parts of the Great Lakes where current concentrations are relatively high. For example, 89% of surface water samples collected across the region exceed the proposed risk thresholds for food dilution toxicity. However, all sediment samples remain below the proposed risk thresholds. Accordingly, a necessary and appropriate next step may include convening a workgroup of local experts to develop ecological risk assessment and management frameworks for the region comprising thresholds of concern for microplastics in surface water and sediment. Ultimately, microplastic pollution should be addressed in the Great Lakes Water Quality Agreement to ensure coordinated and sustained efforts are taken by the governments of Canada and the United States to reduce their release and impact.

Designing public policies to effectively address comingled economic, social and environmental issues is a fundamental challenge facing sustainable development policy-makers in the twenty-first century. Raising the stakes is the added challenge of doing so in today's complex, dynamic and uncertain conditions. Policies that cannot perform under such conditions run the risk of not achieving their intended purpose and hindering the ability of individuals, communities and businesses to cope with and adapt to change. To explore the principles of adaptive policies, a four-year empirical investigation was launched in Canada and India to extract practical insights from complex adaptive systems literature and to study the characteristics of policies that have been effective under changing socio-economic and environmental conditions. Seven core principles for creating adaptive policies were identified and a practical policy analysis tool was developed to help policymakers translate the principles into tangible recommendations. This paper presents the results of applications of the ADAPTool (Adaptive Design and Assessment Policy Tool) by four provincial governments in Canada on policies aimed at supporting climate change adaptation efforts. Lessons learned from the applications are discussed. ARTICLE HISTORY