Living in a world beset by rising sea level, floods in urban and suburban areas, air pollution, and food security risks, it is urgent to mitigate threats by adapting to climate change. In September 2019, the UN Climate Action Summit declared Natural-Based Solutions (NBS) as one of the major action domains, paralleled with Climate Finance and Carbon Pricing, Energy Transition, Industry Transition, Infrastructure, City and Local Action, Resilience and Adaptation, etc. This important approach to fulfilling the Paris Agreement globally could crucially help reduce climate risks and build climate-resilient cities in an economic, efficient, and sustainable way.