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A core issue in these solutions is that a stronger case than presently available is needed to underpin the cost- effectiveness of integrative nature-based solutions. The Ecosystem Services approach is an important instrument in this respect, but cases based on 'willingness to pay' are not considered strong enough to hold in court (EEA et al., 2015); although in other cases, this approach has been welcomed by policy makers for making such services visible. Promising services are those that lead to cost savings on maintenance. Building stronger cases will not only be instrumental in attracting funds, but also and in parallel in building up institutional and public support.