Warsaw is one of the greenest capital cities in Europe. It was rebuilt after World War II with abundant parks, squares and gardens. Most of the unique green infrastructure is situated along the corridor of the Vistiula River. This area includes nine urban nature preserves, 3000 acres of allotment gardens and 20,000 acres of urban forests. In addition to their ecological functions, this green infrastructure network is also valued for its contribution to hydrologic systems and climate resilience. This lecture will investigate the performance of the many types of green infrastructure in Warsaw.