Changes in global climate are increasingly having adverse impacts on human populations and natural systems. This has resulted in increased efforts to come up with options that can mitigate the impacts, as well as help to adapt to already occurring changes.

This booklet sets out guidance for assessing the effectiveness of an ecosystem-based approach to climate change adaptation. It describes a process, based around asking a detailed set of questions, that can be used by project managers and researchers to shape project design, assess the progress of an ongoing project or draw conclusions about the effectiveness of a project that has ended.

The idea of ‘nature-based solutions’ (NBS) is now being used to reframe policy debates on biodiversity conservation, climate change adaptation and mitigation strategies, and the sustainable use of natural resources, among other issues. While interesting and potentially useful for those debates, it is a concept that still needs to be clearly defined; its use is not confined to discussions about ecosystem services and natural capital.

The presented study aimed at identifying and assessing public preferences for variations in tree species composition, tree height structure, and presence of dead trees left for natural decay—forest characteristics which are likely to be affected when subjecting stands to nature-based forest management in the temperate, nemoral deciduous zone. Data were collected by means of a questionnaire and by applying choice experiments to elicit people's willingness to pay (WTP).

In this paper, we reflect on the implications for science, policy and practice of the recently introduced concept of Nature-Based Solutions (NBS), with a focus on the European context. First, we analyse NBS in relation to similar concepts, and reflect on its relationship to sustainability as an overarching framework. From this, we derive a set of questions to be addressed and propose a general framework for how these might be addressed in NBS projects by funders, researchers, policy-makers and practitioners. We conclude that:

"There is great interest in the restoration and conservation of coastal habitats for protection from flooding and erosion. This is evidenced by the growing number of analyses and reviews of the effectiveness of habitats as natural defences and increasing funding worldwide for nature-based defences–i.e. restoration projects aimed at coastal protection; yet, there is no synthetic information on what kinds of projects are effective and cost effective for this purpose.

The decision to transform “classical” age-class forests (plantation forestry) into more nature-based forest stand structures implied a paradigmatic shift in the Danish state owned forests and their management. In order to facilitate this process of change, scientists were employed by the Danish Forest and Nature Agency which enabled interactions with the professionals in the forest over a nearly 2-year period.

Many national and international environmental agreements acknowledge that the impoverishment of ecosystems is limiting the world’s capacity to adapt to climate change and that ecosystem-based adaptation (EbA) approaches should be harnessed as a priority. EbA has the potential to increase adaptive capacity and social and ecological resilience to climate change in both developed and developing countries.

Many of the world’s vital natural ecosystems, and the communities reliant on them, are vulnerable to climate change. But there is increasing recognition that ecosystems — if sustainably restored and protected — can also form a strong line of defence against the direct impacts of climate change and support human adaptation over the long term. As the evidence base grows, ecosystems are increasingly prominent in climate change policy, especially in developing nations. Yet intentions rarely translate into robust and informed measurable targets, undermining action.