<p>This guide explores the benefits of using nature-based solutions to promote sustainable and resource-efficient infrastructure.</p><p><br></p><p>Nature-based solutions are interventions to protect restore and sustainably manage natural or modified ecosystems to support both biodiversity and people's well-being. This guide includes case studies from Bangladesh Nepal the People's Republic of China the Philippines and Viet Nam. It considers challenges and opportunities and shows how nature-based solutions can be mainstreamed in the portfolio of the Asian Development Bank.</p>