This report, prepared by the Dutch Ministry of Infrastructure and Water Management, provides an analysis of the Dutch procurement system.

The Dutch Sustainable Public Procurement (SPP) approach embraces six themes, two of which are explored in this study: climate-neutral procurement and circular procurement. Included in these two themes are aspects such as CO₂ and other greenhouse gas emissions, as well as the reuse of raw materials at the highest possible level of value. SPP is a highly topical issue for a steadily growing number of organisations in the Netherlands: action plans are being written, requirements and criteria are being formulated, and tools are being produced. Together, these activities are creating growing demand for instruments that evidence the impact of SPP.

Longstanding research on wood cascading has identified a variety of factors to enable more efficient, circular use of forest-based products in Europe.

This paper finds that two of the most critical barriers to wood cascading are:

• Competition between energy and material uses of waste wood in policy, market and infrastructure
• Inadequate information on and low quality of waste wood, including pollutant content.

It makes the following recommendations for policies and business:

• Redesign production processes to deal with contamination and increase quality
• Coordinate energy and waste policies
• Advance reporting standards about material composition of bioproducts
• Explore the best forms of involvement, awareness raising, communication and policies.

Urban agriculture comes with its own share of environmental impacts. Circular strategies promise to reduce these impacts, but not all strategies are resource efficient and environmentally effective.

This paper finds that the most eco-friendly and circular strategies for urban agriculture, taking a Mediterranean tomato crop as a case study, include:

• Struvite (phosphate mineral recovered from wastewater treatment) instead of non-renewable phosphate fertiliser to conserve freshwater
• Recycled steel and materials for urban agricultural infrastructure to reduce carbon emissions, toxicity and freshwater pollution
• Closed-loop irrigation to minimise ocean and freshwater pollution. However, if new infrastructure is required, it could lead to an increase in carbon emissions.

The circular economy (CE) is gaining momentum in cities. To ensure a sustainable CE, it is crucial to measure the environmental performance of CE strategies. However, environmental assessments overlook several strategies that are a key feature of urban CE practice. These include reuse and repair, sustainable built infrastructure and urban land use, green public procurement, smart information and access technology.

To provide insights into the environmental performance and potential of these strategies, industrial ecologists and municipalities should:

• collaborate with urban systems experts
• quantify the environmental impacts of entire urban systems
• combine environmental assessments with social and economic feasibility ones.