Bringing nature into decision-making and policy design. Experiences from overseas Europe

Although many legal instruments have been adopted at the international and European Union levels to conserve biodiversity, con- tinued degradation calls for reflections on their national and local implementation. The article examines biodiversity policy implementation in the outermost European region of Canary Islands, a Spanish archipelago rich in biodiversity. In particular it focuses on the policy uptake of new concepts. It deals with the valuation and integration of the services provided by nature into decision-making, and the application of policy measures based on the use of the planet ’ s natural assets. The article also analyses the challenges encountered in such institutional change. The concepts of ecosystem services and nature-based solutions are relatively new in the scientific literature and almost absent in policy literature. This article aims to stress the relevance of these concepts for the development of more innovative policies that bring nature and its services into decision-making and policy practice.


Introduction
Human development has compromised the health of many natural habitats and their associated flora and fauna in Europe (EEA 2015) as well as in most parts of the planet (IPBES 2019). Biodiversity has decreased at unprecedented rates in human history, mainly in the 20th century with predicted further reduction in the coming decades (Arjjumend, Koutouki, and Alam 2016;Soler Luque and Kostecka 2019). As reported by the European Environment Agency in its latest document on the state of the environment (EEA 2019), about 75% of the terrestrial environment and 40% of the marine environment are now severely altered globally. In the European Union (EU), only 17% of habitats and species and 11% of ecosystems are in a favorable state and about 200 species disappear every day (Arjjumend, Koutouki, and Alam 2016). Several human activities and phenomena are at the root of this alarming biodiversity loss, as direct or indirect causes or "pressures" (Table 1); (EU 2011;Maes et al. 2018;Puppim de Oliveira et al. 2011;Soler Luque and Kostecka 2019;Wanjui 2013).
The protection of the environment and the conservation of natural habitats and species is one of the policy priorities of the EU as recently confirmed by the European Commission (EC 2020a) and the Council of the European Union (CEU 2020). The EU has issued a vast amount of environmental legislation by its own initiatives and in compliance with a variety of environmental conventions adopted at the international level. This has led to a rich array of legally binding directives and regulations, as well as policies, programs, action plans, strategies, and other political documents (Annex A). The core of EU environmental legislation is built on three major pillars that consist of the following directives: The Birds Directive (BD) and Habitats Directive (HB), also known together as Nature Directives; the Water Framework Directive (WFD); and the Marine Strategy Framework Directive (MSFD) (Maes et al. 2018). They constitute the "four main environmental directives" of the EU (Table 2) (Rouillard et al. 2016). The most important strategic document for the purpose of this article is the EU Biodiversity Strategy adopted and regularly updated by the EU since 1998 as a Contracting Party to the Convention on Biological Diversity 1 (CBD) signed by the EU in 1992. The accomplishment of the objectives of the EU Biodiversity Strategy strongly relies on the success of the abovementioned four Directives (Rouillard et al. 2016).
Despite the international and EU efforts in promoting biodiversity protection and restoration, current national policies and policy practices still neglect the importance of our natural assets. Policy makers are rarely trained and aware of the value of nature that can be used to shape better policies. In particular subnational governments can play a crucial role in the implementationand therefore, the successof national policies and strategies for the conservation of biodiversity (Walter 2017). Local and, more extensively, sub-national implementation in the EU is extremely challenging in those remote areas of the Union that are characterized by geographical, constitutional, and institutional peculiarities, such as its overseas entities.
The article investigates the implementation of biodiversity policy in on one of these overseas entities, i.e. the Canary Islands. The Canary Islands is chosen because it constitutes a relevant case. It is part of Macaronesia, an important geographical area for biodiversity; it is also an autonomous region of Spain, a country characterized by the highest degree of biological diversity in the European continent (OSE 2012). More precisely, the article analyses the uptake of nature and its assets in national and local policies, strategies, and actions, and highlights the major challenges faced by such change in policy formulation and design. After clarifying some concepts (Section 2) and motivating the geographical focus (Section 3), the article analyses the incorporation of the values of nature in biodiversity policy in the Canary Islands as an outermost region of Spain (Section 4). Finally, it discusses the complexity of such change and develops possible ways to overcome major obstacles. Section 5 concludes the article.

Conceptual clarifications
Biological diversity, or "biodiversity", refers to the variety of life present on Earth (OSE 2012; Soler Luque and Kostecka 2019). It includes animals, plants and micro-organisms and is the building block of our ecosystems (Puppim de Oliveira et al. 2011;Wanjui 2013). An ecosystem is "a dynamic complex of plant, animal, and micro-organism communities and their non-living environment interacting as a functional unit" (UN 1992). Examples of ecosystems are forests, coral reefs, deserts, estuaries, and rivers (OECD 2018).
Ecosystems have important functions for our economic and social well-being that fall under the name of "ecosystem services" (ESs) as defined during the millennium ecosystem evaluation in the early 2000s (OECD 2018). Examples of ESs are the provision of food, fresh water, clean air, and materials (e.g. timber). Other important, though less obvious, ESs are the protection from natural disasters (e.g. through the moderation of floods), regulation of climate, purification of water, pollination of crops, decomposition of waste, and regulation of pests and diseases. Ecosystems also provide important cultural services (Table 3) (McFarland and Gerdes 2016;Wanjui 2013). In particular, marine ecosystemse.g. seagrass beds and mangrovesare well-known carbon sinks with a key role in climate change (CC) adaptation and mitigation (MACOBIOS 2019). Through ESs, the planet's natural assets (i.e. Earth's environmental resources) provide us with important inputs for our economies and societies (UNSD 1997). The degradation of natural ecosystems alters their provision of ESs with negative consequences for human well-being (McFarland and Gerdes 2016). Therefore, the concept of ESs can have an important impact on policy-making for biodiversity conservation at all levels of governance.
The value of nature for addressing environmental, social, and economic challenges has been largely acknowledge by science, practitioners, civil society, and the business sector (Maes and Jacobs 2017). However, the uptake of ESs in decisionmaking is advancing slowly and remains predominantly in international debates rather than in national practices where their valuation is still confined to punctual exercises. In 2011, the EU included ES valuation in its "Biodiversity Strategy to 2020" (EU 2011) under Action 5. The review conducted by Maes, Teller, and Erhard (2014) on the achievements reached under this action reveals, though, a lack of integration of the concept of ESs in European environmental policies. In the "Biodiversity Strategy to 2030" that was recently released (June 2020), the EU has no longer defined a specific action on the use of ESs but it has recognized it as prejudicial to the implementation of sound policies.
The valuation of ESs has its skeptics about both its ability to supply accurate data and the use of such data. On a large scale, values are often astronomically high as shown by studies around the world. For instance, the estimated annual value of ESs within marine protected areas in some non-EU islands reaches USD 9 billion in the Bahamas (Arkema, Fisher, and Wyatt 2017) and USD 48 billion in Seychelles (Laine 2020). Consequently, ESs are hard to compare to economic reality or to integrate in a national accounting system. Practitioners debate methodological questions, notably issues surrounding benefit transfer and the aggregation and use of the results. Even the core principle of valuation is questioned, since studies tend to show that the more humans exploit an ecosystem, the more its economic value increases, boosted by direct Provisioning services Provision of food, potable water, raw materials (e.g., timber) and energy; Production of biomass.

Regulating services
Regulation of climate, air pollution, floods, fire; water purification; Waste assimilation; noise reduction; rainwater drainage; sewage treatment; oxygen production; protection of the seacoast against currents and waves; feeding of many species; carbon dioxide sequestration; pests control; pollination support. Cultural services Cultural developments; spiritual meanings; leisure and recreational use (e.g., in nature reserves); aesthetic interactions; ecological knowledge; physical and mental health.
use values (Failler et al. 2010;Tr egarot, Failler, and Mar echal 2017). Such results run counter to marine biodiversity management policies that tend to limit ecosystem services uses. In this intricate context, a new term has merged in environmental research and management, i.e. Nature-Based Solutions (NBSs; Cohen-Shacham et al. 2016). The term appeared in the early 2000s in the policy practice and international reports (e.g. World Bank 2008). It has been used in the scientific literature only in the last few years (among the first works, see Eggermont et al. 2015;Kabisch et al. 2016;Maes and Jacobs 2017). However, the concept is still not well developed in journals falling under policy science despite its relevance for the development of new policy measures and their inclusion in more innovative policy design that relies on ESs and natural assets. According to Walter (2017), reliance of policy design on NBSs gives a new value to nature by bringing it in the decision-making.
While the term has gained momentum in different stakeholder communities (Faivre et al. 2017), it is still quite "vague or unknown" to the larger public (Nessh€ over et al. 2017). Several definitions have been suggested for NBSs; in simple words, they are solutions that use nature and rely on ESs to tackle societal challenges such as climate change, food security, water provision, natural disasters, human health, and our socioeconomic development (EC 2020b). NBSsalso called green (and blue) infrastructure or ecosystem-based approachesare all those actions that protect, restore and manage ecosystems in a sustainable way, and lead simultaneously to human well-being and biodiversity benefits (Cohen-Shacham et al. 2016). NBSs include a plethora of possible interventions; see Table 4 for a categorization developed by the International Union for Conservation of Nature (IUCN). We are particularly interested in "ecosystem restoration" and "ecosystem protection" for the case analyzed in this article. Ecosystem protection is the practice of protecting the natural environment and its resources without further direct action to improve its status. Ecosystem restoration consists of any attempt to repair, enhance, or assist the recovery of an ecosystem that is degraded, damaged, or destroyed (Cohen-Shacham et al. 2016).

Case selection: why look so far?
The EU has included 34 overseas entities until Brexit. They either belong or are linked to six of its current or ex-Member States (MSs): Denmark, France, the Netherlands, Portugal, Spain, and the United Kingdom (UK). Nine outermost regions (ORs) are part of these countries; hence they fully comply with the acquis communautaire (i.e. the body of EU laws); the remaining 25 overseas countries and territories (OCTs) are not part of these states and have no obligation to comply with EU laws, but benefit from association with the EU (Benzaken and Renard 2011).
All overseas entitiesboth ORs and OCTsshare peculiar geographical characteristics, i.e. remoteness, insularity, small size, difficult topography, and exposure to climate threats (Azevedo 2017). Remoteness and the insularity (of most of them) have allowed the growth of rich biodiversity on land and, even more so, at sea (Menini et al. 2018). The EU's overseas entities are spread across all oceans and host a diversity of ecosystems that make up more than 70% of the EU's biodiversity. They also are home to more than 30% of the globally threatened species, which makes them important for biodiversity at the global scale (Benzaken and Renard 2011;Kettunen and Bezerra 2008;Petit and Prudent 2008). However, the same traits (remoteness, insularity, small size, and difficult topography) make implementation of national policies rather challenging. For instance, coordination with central authorities demands major efforts; monitoring and enforcement by the central government and agencies is difficult; access to technical expertise is limited (McFarland and Gerdes 2016). It is thus important to assess whether and how national policies and strategies are implemented here, and define not only which factors hinder implementation but also which local actions can support national legal frameworks for biodiversity (Benzaken and Renard 2011).
EU overseas entities can be grouped into separate biogeographic regions: polar and subpolar regions; Amazonia; the Caribbean; South Atlantic; Pacific;the Indian Ocean; and Macaronesia. Macaronesia is an important biodiversity hotspot 2 (EU BEST 2016). With its deserts, mountains, forests, rivers, and islands, the region has a unique biogeography made of flora and fauna that reached the archipelagos from adjacent continental areas via long-distance dispersal (Whittaker and Fern andez-Palacios 2007). This region is situated in the North East Atlantic Ocean and shared by three countries: Spain and Portugal (within the EU) and the Republic of Cape Verde (Figure 1). The region encompasses a total of 28 main islands, seven uninhabited ones and more than 100 islets (Menini et al. 2018). Looking at EU land only, Macaronesia is composed of three archipelagos: Azores and Madeira (Portuguese ORs) and the Canary Islands (an OR of Spain) (Tuya and Haroun 2009).
In particular, the Canary Islands represents one of the richest biodiversity hotspots in Europe (Benzaken and Renard 2011). It is also the biggest archipelago of Macaronesia (Menini et al. 2018); with more than 2 million inhabitants, it is the most populated of all European overseas entities (EU BEST 2016). It includes seven major islands divided into two administrative provinces. Lanzarote, Fuerteventura, and Gran Canaria (together with some minor islands) form the Province of Las Palmas. Tenerife, La Gomera, La Palma, and El Hierro form the Province of Santa Cruz de Tenerife (EU BEST 2016; Madruga, Wallenstein, and Azevedo 2016). The Canary Islands is a region of Spain and one of its autonomous communities (ACs).

Changes in policy design and practice in the Canary Islands
This section analyses the changes in policy design and practice that have occurred in the last two decades in Spain under the pressure of international environmental obligations, increasing political attention to ESs and local experimentation with NBSs.

A national strategy and its subnational implementation
For a long time, Spain did not have a consolidated national environmental law, but several legislative texts supported by multiple strategies and programmes. Under the CDB 3 's legal obligations, the country issued its first national strategy for biodiversity in 1998 (Estrategia Española para la Conservaci on y el Uso Sostenible de la Diversidad Biol ogica). The National Biodiversity Strategies and Action Plans (NBSAPs) serve as The development and adoption of the NBSAPs is a complex process that requires the involvement of government, the private sector and society at large; their implementation needs to engage stakeholders at both national and local levels. Spain's current 4 strategic plan was developed with the active engagement of political, economic, and social actors ( The national strategic plan applies to the Canary Islands. In addition, this autonomous region can also approve its own strategy. Indeed, this AC has its own government, parliament, and exclusive competence in several fields: physical planning, land management, hunting, fisheries in inner waters, aquaculture, water management, scientific research (in coordination with the Spanish State), natural protected areas, and coastal zone management. Funds for nature conservation come from the regional authorities. The Canary Islands has a tradition of good collaboration with central authorities. For instance, it reports periodically to the national government about the actions implemented at the regional and local level for the preparation of national reports under the CBD. In general, the region shows good institutional interaction among all actors involved in biodiversity, i.e. its biodiversity policy community: government departments, research laboratories, universities, NGOs, and municipalities (Benzaken and Renard 2011).
The presence of a harmonious policy community has certainly played in favor of implementation. According to Benzaken and Renard (2011), most objectives of the CBD have been achieved in the Canary Islands. The region has approved legislation by establishing and regulating a wide set of protected areas (both on land and in the ocean) and issued catalogues of protected species (EU BEST 2016). It has also implemented several actions for biodiversity protection and restoration. The result is that about 40% of the territory of the Canary Islands is under some form of protection (Benzaken and Renard 2011). The region has also experimented with the use of NBSs for ecosystem restoration.

Restoration projects at the local level
The uptake of innovative NBSs in policy-making and their integration into public polices can be promoted by the action of the subnational level (Walter 2017). A good example is provided by the local attempts to restore seagrass meadows in the sea waters of the Canary Islands. We focus on seagrasses because they constitute one of the most valuable ecosystems in the world; yet they have been in decline all over the planet since the 1930s. According to the UN (UNEP 2020), an estimate of 7% of seagrasses are lost worldwide every year, which equates to the loss of a football field (of seagrass) every 30 min.
Seagrasses are plants of the marine environment; they create meadows on the seabed and can be considered as "underwater forests". Like forests on land, they are essential habitats for a variety of species; they also contribute to human wellbeing through a variety of ESs. They are an important source of oxygen and natural sinks of carbon dioxide in the fight against climate change; they clean the surrounding water; they capture sand and stabilize the sediment, thus protecting the coastline against erosion and floods. Therefore, the loss of seagrass meadows will affect humans both directly and indirectly since it will lead to decline in marine biodiversity, levels of oxygen, quality of water, beach sand and substrate's stability, and fishing resources (OCEANA 2010; UNEP 2020). Severe losses of seagrass are occurring in Spanish waters, including those of the Canary Islands (OSE 2012).
Although natural causes (e.g. wave action and winter storms) can damage seagrass beds, the major threats to these marine plants come from human activities: irresponsible fishing with destructive practices (e.g. by bottom trawling); mass tourism (e.g. anchoring on seagrass); poor coastal management (e.g. construction of ports); water contamination (e.g. due to discharges from agriculture); and many more human activities (e.g. aquaculture and sand extraction) (OCEANA 2010). The conservation of seagrass meadows can be pursued by combining measures that protect the existing bedse.g. marine protected areas, regulations to prevent pollution or destructive fishing practices, and sanctionsand instruments that help the degraded areas to recover such as replanting.
Regarding the protection of seagrass at the global level, the UN points out that " [o]f the known distribution of seagrasses, only one quarter (26%) occurs within MPAs" (UNEP 2020, 63); this indicates a general neglect for seagrasses protection in biodiversity policies. By contrast, a relatively large number of local initiatives have tried to restore seagrass meadows, by either collecting and transplanting adult plants, or obtaining and planting seeds (OCEANA 2010). The debate about these techniques and their risks falls out of the focus of our article; suffice to stress, here, that more scientific knowledge is needed as we argue later in this article (Section 5.1).
Several local projects to restore seagrass were conducted in Spain, too. These initiatives have been driven by NGOs, private actors, or scientific institutions andmore oftenby a combination of actors. An example of collaboration between an NGO and a private actor is the seagrass restoration project conducted by OCEANA 5 and Banco Santander Foundation along the coastline of Almeria with the endorsement of the Regional Government of Andalusia (OCEANA 2010). Another project took place in the early 2000s in the Canary Islands and was carried out by the Instituto Canario de Ciencias Marinas (ICCM; Canary Institute of Marine Sciences). The ICCM depends upon the Regional Government of the Canary Islands; it is an institute devoted to research, technological development, and innovation. The ICCM conducted a series of experimental transplants (and relocation) of a species of seagrass, Cymodocea nodosa, across the waters of the archipelago. Cymodocea nodosa is a protected species under the legislation of the Canary Islands (Decree 151/2001). The success of some of these small-scale pilot projects (e.g. in Gran Canaria and Lanzarote) contributed to the restoration of seagrass beds. In addition, a regional Conservation Plan was drafted for this species.

Putting change into practice
In this section, we present considerations on two major implementation challenges that we draw from our empirical study on the Canary Islands: the uncertainty existing in science and the involvement of stakeholders and local actors. We acknowledge that nature-based policy development using ESs and NBSs must recognize the institutional history of a specific context and its social heritage. As stated by Barton, Ring, and Rusch (2014, 6), "[a]chieving biodiversity conservation and ecosystem services provision includes attuning policy mixes to societal challenges which are local and place-specific". Although we will not aim at complete generalization of our considerations, we try to set the direction for future action beyond the case study presented in this article.

Reducing scientific uncertainty through research and local knowledge
Political science literature has traditionally explained public policy developments by appealing to three key factors: actors' interests and ideas, as well as institutions. Interests refer to the preferences of various stakeholders (elected officials, civil servants, societal groups, etc.) that are willing to achieve their own ends with maximum benefit at minimum costs. Ideas refer to factual knowledge such as scientific evidence, technical expertise, or experiential knowledge of societal groups about public problems and possible solutions 6 . Institutions are the rules (both formal and informal) that structure political behavior, for instance laws, organizational practices, and policy legacies (Gauvin 2014).
In the context of this paper, we want to focus on ideas understood as knowledge and, more precisely, on the uncertainty and complexity that affect scientific knowledge. Scientific evidence is rarely complete and often dynamic and contestable (SAPEA 2019). Based on their very nature, the success of NBSsthat employ ESslargely depends on the scientific knowledge we possess on ecosystems and their dynamics (Cohen-Shacham et al. 2016). Not all projects of seagrass beds' transplants and relocation have worked as hoped because scientific knowledge is often lacking. Knowledge gaps exist, for instance, about the conditions of the donor bed, threats and opportunities of the future location, dynamics of seagrass' recovery, and interactions with the surrounding environment (OCEANA 2010).
Gaps in the knowledge of these aspects and, more broadly, on habitats and ecosystems exist beyond the specific case study investigated here. Lack of adequate data seems to affect many other overseas entities of the EU, both ORs (e.g. Reunion and Azores), and OCTs (e.g. Nouvelle-Cal edonie and Sint Maarten) as we have experienced during our research 7 . Weaknesses in the available data on ecosystemsand consequently their servicesalso affect policy-making in European countries as reported by a policy expert from an environmental international NGO (Interview file MO.01.XI.20;UK, 27 November 2020). Similarly for NBSs, "[t]he gaps in knowledge are often still of a fundamental character and need to be addressed in order to inform future NBS projects" (Nessh€ over et al. 2017(Nessh€ over et al. , 1223. The lack of evidence can hamper the adoption and implementation of adequate management measures where the political commitment to biodiversity is not strong enough. More generally, weak knowledge of ecosystems, ecosystem dynamics and services may enhance the political neglect for including ESs in policy decisions and NBSs in policy design (McFarland and Gerdes 2016). As clearly stated by Farrell and Finnemore (2016), it is difficult to advance new ideas in the absence of good data.
Knowledge gaps are usually substantial in marine ecosystems due to the complexity of these ecosystems and limited access to the marine environment. In particular, the EU's overseas entities (both ORs and OCTs) still lag behind in the mapping and assessment of their ecosystems and related services. Although funding has found some financial sources in EU projects, EU's overseas entities often lack technical skills and need to rely on research centers located in mainland Europe. Furthermore, understanding ESs supposes that we have good knowledge of the ecosystems present in a territory and their condition. With a focus on our case study, comprehensive knowledge about the condition of habitats and species in Spain is still far from complete (Real Decreto 1274/2011).
There are not only serious data limitations associated with the valuation of ESs but also a complex scientific debate about methodological aspects. First, the growing number of valuation methods risks to shift attention away from the initial objective of providing a valuation of the ESs (monetary or not) toward discussions about techniques and their limits. Second, there is no clear direction on how to integrate ESs into policyand decision-making (BSR 2013). Although many efforts have been made to improve the science-policy interface (Bagstad et al. 2013;Grêt-Regamey et al. 2017), any doubt regarding the reliability of the valuation and any difficulty to operationalize ESs represents an additional constraint to convince policy-makers of the validity of the approach.
While knowledge needs to be reinforced, scientific research is not the only possible route to follow. A good amount of information, expertise and ideas can be brought into policy-making by the public. Indeed, knowledge is not limited to the scientific community. Quite the opposite, experts working in isolation from local populations may overlook important aspects that are well known to the latter. Therefore, better policy design can be achieved not only with more scientific research but also through public involvement. Experts and lay knowledge are complementary; in particular, public involvement will expose policy-makers to a wider range of perspectives, priorities, and values (Thomas 2012), which is strongly needed for the application of ESs and NBSs as we argue in the following section.

Increasing public engagement
The importance of public engagement in policy decisions is undeniable in the modern systems of governance. The multiple reasons why public involvement is pivotal for better decision-making can be simplified into three major benefits. On the substantive (or cognitive) level, public involvement improves the "quality" of public decisions by bringing a broader spectrum of ideas and knowledge into policy-making. On a political (or instrumental) level, public involvement enhances the "legitimacy" of the way public decisions are adopted; in turn, legitimacy increases "trust" in the government and eases the implementation of policy initiatives. On an ethical (or normative) level, public involvement strengthens the "democracy" of a political system and its public support (Thomas 2012). These advantages of public involvement (i.e. quality, legitimacy, and public support) also apply to the topic investigated in this article. The involvement of people can be useful for three important reasons: improving knowledge on NBSs and ESs, easing the adoption of innovative policy measures and gaining public support for NBSs.
First, the utilization of NBSs relies on the concept of ESs. For the full understanding of what services are provided by ecosystems (such as seagrass) and their inclusion in policy decisions, the mapping and assessment of ecosystem services (MAES) is required. MAES exercises have started in many parts of the EU's overseas entities, for instance in Macaronesia and particularly in the Canary Islands (MOVE 2020). However, the policy uptake of the ESs concept is, in general, still weak. In particular, the inclusion of ESs in decision-making in many ORs and OCTs is still affected by their insularity, the fragmentation of efforts across many overseas entities, insufficient financial resources, limited availability of data for many areas and lack of knowledge. Furthermore, any meaningful MAES endeavor needs to be participatory and involve stakeholders. This is crucial for the understanding of how the loss of specific ecosystems will affect different actors. Therefore, local knowledge and stakeholders' perceptions needs to be included if the goal is to inform decision-making with more complete knowledge and expertise. Such approaches that integrate a socio-ecological analysis with biophysical insights is still lacking for many ORs and OCTs (Geneletti et al. 2020).
Second, informing and including the public in MAES will not only lead to more knowledge that will strengthen the gaps highlighted above. It can also ease the adoption and implementation of ESs and NBSs and raise awareness among people about nature and its services. Public engagement tends to generate legitimacy and trust (Thomas 2012), which has a positive impact on policy implementation. Indeed, decisions recognized as legitimate by the affected groups are likely to face less opposition. Public involvement produces higher rates of implementation through the legitimation and acceptance of decisions, and the reduction of (exiting or potential) conflicts among competing interests (Ferraro 2019). This is important for our case. Maintaining ecosystem and ecological functions often implies tradeoffs with other uses of the land. These tradeoffs need to be fully acknowledged while adopting NBSs, in order to consider the possible disturbance that reliance on ESs and NBSs may cause to vested interests. In many cases, public decisions on NBS design, costs, location, scale, and management will involve a variety of stakeholders who may have quite different opinions on the best ways of managing their problems. NBS will have to be accepted as alternatives to other solutions (Nessh€ over et al. 2017). The case of Canary Islands is an example of good public engagement at the subnational level and institutional collaboration with the central authorities for the adoption and implementation of a national strategy for biodiversity in compliance with international and EU obligations for biodiversity protection and restoration (Section 4.1).
Third, if the uptake of ESs and NBSs is done inclusively, this can even generate public support to advance policy reform for biodiversity conservation or oppose myopic policy decisions. In other words, aware, informed and engaged publics can exert pressures on politicians at the local level to uptake ESs and apply NBSs. Public engagement is important to steer more NBSs in the policy practice. Several seagrass restoration projects in Spain have been promoted by a combination of actors: NGOs, the private sector, and scientific institutions (Section 4.2). Indeed, NBSs (such as ecosystems restoration measures) can be: "government-driven initiatives," when the government plays an active role in the restoration and management of specific habitats; "NGOs-driven initiatives," when (local and international) NGOs direct restoration activities and also engage local stakeholders; "community-driven initiatives," when local communities embark on restoration activities without external assistance once they face the ecological impact of biodiversity degradation; and based on a "mixed approach," when government agencies, NGOs and local communities work together in the restoration and management of degraded habitats (UNEP-Nairobi Convention/USAID/WIOMSA 2020). In almost all approaches the importance of public engagement is undeniable.

Conclusion
Spain has clearly experienced a change in its policy design for biodiversity. This has happened under the pressure of international rules at the global and EU level. Spain is one of the EU's MSs with the richest biodiversity because of many factors, including the geographical position and extension that embraces remote areas such as the Canary Islands. Biodiversity loss in the country is accelerating under several pressures such as changes in land use, overexploitation of natural resources, pollution on land and at sea, the spread of invasive alien species, and climate change (OSE 2012). Biodiversity loss is more acute in some areas of the country, such as the Macaronesian islands (Ministry of the Environment, and Rural and Marine Affairs 2011). Pressures on biodiversity are not likely to decrease in the coming years; in particular, climate change will be increasingly worrying for mainland Spain and its archipelagos (OSE 2012). Similar dynamics will affect other EU's overseas entities and biodiversity hotspots (IPBES 2019; MOVE 2020). The current national policies of many countries have not halted biodiversity loss despite the several international obligations that commit states to the conservation of ecosystems (IUCN 2018). Now, more than ever, it is pivotal that national governments implement those commitments and develop new domestic biodiversity policies that fully acknowledge and incorporate nature both in the process of decision-making and in policy design (Tr egarot, Failler, and Mar echal 2017). Unfortunately, policy reforms are not easily achieved, especially when change concerns not only the instruments available but also the objectives of public intervention (Hall 1993). However, starting from the Spanish case and Macaronesia, the article has shown some possible pathways to attain such change.
First, the socio-economic gain coming from biodiversity protection and restoration needs to be made clearer to policymakers and the general public. Despite the recognition of the relevance of ESs at the international level, the value of biological diversity is not yet sufficiently applied in national public decisions (OSE 2012). Unfortunately, we argued, the calculation of this value brings along some level of scientific complexity that might weaken its adoption. Experts from several disciplines (economists, ecologists, and social scientists) have worked in the last decades to improve the valuation of ESs in monetary, social, and political terms so that it can be more easily incorporated into the decision-making process (Archer et al. 2018;Failler et al. 2015;OSE 2012). However, some knowledge gaps still exist, which leads us to our next point.
Second, more scientific research on ecosystems dynamics is needed, particularly in EU's overseas entities where capacity is often lacking despite their crucial role for biodiversity. Stronger scientific evidence can also benefit the uptake of new policy measures in policy design. Scientists from different disciplines need to fill existing knowledge gaps and provide guidance to policymakers and all other relevant stakeholders on more innovative and effective measures. In the effort to fill these gaps, scientific research can be complemented by local knowledge; yet this will require more inclusive practices of decision-making that are not common across all EU's overseas entities.
Third, public participation needs to be enhanced in biodiversity policy as well as in all environmental matters as requested by the Aarhus Convention 8 more than two decades ago. Inclusive decision-making, harmonious center-local relations and local entrepreneurship have certainly played a positive role in the case analyzed in this article, both for the adoption and implementation of a new national strategy acknowledging ESs and the local uptake of new policy measures like the NBSs. Notes 1. In 1992, the United Nations Conference on Environment and Development (or the Rio "Earth Summit") led to the adoption of three important conventions: The Convention on Biological Diversity (CBD), the United Nations Framework Convention on Climate Change (UNFCCC), and the United Nations Convention to Combat Desertification (UNCCD). In particular, the CBDthat came into force in 1993represents the main global instrument and most comprehensive international agreement for biodiversity conservation (Arjjumend, Koutouki, and Alam201662;Benzaken and Renard 2011). 2. Biodiversity hotspots are places on Earth that are both biologically rich and deeply threatened. For more information, see https://www.conservation.org/priorities/ biodiversity-hotspots (last accessed: August 13 2020). 3. Spain ratified the CBD in 1993. 4. Although Law 42/2007 foresees that the strategic plan will be revised every six years, the last valid version is still the one adopted in 2011. 5. OCEANA groups several foundations (i.e. The Pew Charitable Trusts, Oak Foundation, Marisla Foundation, Sandler Foundation, and the Rockefeller Brothers Fund). It is an international non-profit organisation focusing on oceans and conducting science-based policy campaigns. More information is available at www.oceana.org (last access: October 10, 2020). 6. Ideas can also refer to personal beliefs and cultural values (Gauvin 2014). 7. We conducted several interviews on the uptake of ESs in various EU's ORs and OCTs in the framework of a research project funded by the EU. For more information on the MOVE project see https://moveproject.eu/ last access: Janurary 1 2021). 8. For more information on the Aarhus Convention, please visit https://www.unece.org/env/ pp/treatytext.html (last access: September 9 2020).

Disclosure statement
No potential conflict of interest was reported by the author(s).

Funding
The study has been carried out with the financial support of the European Union represented by the European Commission's Directorate-General for the Environment, under the Programme "Pilot Project -Mapping and Assessing the State of Ecosystems and their Services in the Outermost Regions and Overseas Countries and Territories: establishing links and pooling resources". It forms part of the Project "MOVE -Facilitating MAES to support regional policy in Overseas Europe: mobilizing stakeholders and pooling resources" (Grant agreement N 07.027735/2018/776517/SUB/ENV.D2, www.moveproject.eu). The article reflects only the authors' view; the Commission is not responsible for any use that may be made of the information it contains