Exploring urban green packages as part of Nature-based Solutions for climate change adaptation measures in rapidly growing cities of the Global South

Given a lot of elusive information on the use and implementation of Nature-based Solutions (NbS) in the Global South, this review provides a synthesis of the evidence on the: -(1) distribution of urban green technologies in form of arboriculture and urban agriculture as a part of NbS packages for the sustainability of cities against population growth and impact of climate change; and (2) options of integrating and mainstreaming various NbS packages into city development policies, planning processes, and decision-making agendas. The sustainability of urban green as part of NbS packages and the usefulness for improvement of livelihoods is determined by the spatial (geographical location) and temporal (time of action) scales, and socio-ecological and institutional factors. Various NbS packages have shown the ability for use as climate change adaptation measures throughout the world. These functions include protection from soil erosion, protection from inland flooding, buffering natural resources against drier and more variable climates, protection from coastal hazards and sea-level rise, moderation of urban heatwaves and effects of heat island, and managing storm-water and flooding in urban areas. Furthermore, the benefits of urban agriculture and arboriculture include use as sources of food and generation of income; improve recreation and social interactions, and the sustainability of biodiversity. They also mitigate the impact of environmental pollution and climate change through reduction of gas emissions and act as carbon sinks. While the starting capital and lack of policy on urban agriculture and arboriculture in many countries, the importance of the industry is inevitably a useful agenda especially in the Global South due to vulnerability to the impact of climate change. This review also suggests the inclusion of all institutions, governments, and relevant stakeholders to emphasize gender sensitization at all levels of planning and decision-making in food production and adaptation measures to climate change.