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This report by the International Institute for Sustainable Development (IISD) examines the causes and impacts of urban stormwater runoff and evaluates various governance and financing mechanisms to manage it. The authors contrast traditional 'gray' engineered infrastructure with 'green' infrastructure (GI) and propose the development of stormwater markets—specifically through allowance trading and credits—to attract private investment and reduce the financial burden on public utilities.

This background report, prepared by the Stockholm Environment Institute Tallinn Centre for the BLASTIC project, identifies and classifies the land-based sources and pathways of macroplastic marine litter (>25 mm) to assist municipalities in developing monitoring programmes and action plans, with a specific focus on the Baltic Sea region.