''There is a clear demand for a collaborative knowledge-sharing on climate adaptation and mitigation. As a consequence of urban expansion, green spaces are lost and the available areas for pervious green areas are decreasing. Many cities will experience greater impacts from flooding and heatstress due to climate change. Blue-green and small scale Nature-based solutions (NBS) such as bio swales, raingardens and wetlands offer opportunities to adapt urban areas to the impacts of climate change, but their multiple benefits are often unknown to the wider public. Research suggests that effective management of mitigate flood events and heat stress will be achieved by applying a range of NBS measures at different locations in cities [Majidi et al 2019]. Mapping of these (potential) locations for NBS will raise awareness and contribute to capacity building on climate adaptation. Some open source Climate Change Adaptation Platforms (CCAPs) allow mapping of NBS by citizen science and can help to inform and inspire different stakeholders on the topic of climate adaptation in respective region. The aim of most CCAPs is to facilitate an open and free exchange of knowledge on an international scale. Raising awareness about climate adaptation in urban areas and promoting NBS are also key aims.''