Urban green space (UGS) plays a vital role in enhancing the resilience and livability of cities. However, the distribution and accessibility of these spaces often vary significantly within and between cities, raising concerns about environmental justice and social equity. This study aims to analyze the spatiotemporal dynamics of UGS and assess population exposure and equality implications across eight diverse cities from the Global North (GN) and Global South (GS) over the past three decades. Employing a multimethod approach combining geospatial analysis, remote sensing, and statistical techniques, this study reveals an alarming global trend of decreasing UGS, with GS cities experiencing more rapid decline than GN cities. The analysis of UGS exposure uncovers distinct trends and variations across cities, with GN cities generally having higher exposure but showing a concerning decline over time, while GS cities display mixed patterns. Arid-climate cities Phoenix and Riyadh have managed to maintain low but stable UGS levels despite their unique climatic challenges. Urbanization emerges as a dominant force driving the decline in UGS, with GS cities facing significantly higher pressures than GN cities. The findings highlight the urgent need for comprehensive urban greening strategies that prioritize UGS protection and expansion, innovative policies, community engagement, and data-driven decision-making to promote equitable and sustainable urban environments. This study contributes to the growing research on urban greening by providing a comparative analysis of UGS trajectories and exposure equality implications across diverse cities, underscoring the importance of context-specific approaches and inclusive planning processes.

中文翻译：

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转型中的城市绿地：全球南北八座城市的跨大陆视角


城市绿地 （UGS） 在增强城市的韧性和宜居性方面发挥着至关重要的作用。然而，这些空间的分布和可达性在城市内部和城市之间往往存在很大差异，这引发了对环境正义和社会公平的担忧。本研究旨在分析 UGS 的时空动态，并评估过去三十年中全球北方 （GN） 和南半球 （GS） 八个不同城市的人口暴露和平等影响。本研究采用结合地理空间分析、遥感和统计技术的多方法方法，揭示了 UGS 下降的令人担忧的全球趋势，GS 城市的下降速度比 GN 城市更快。对 UGS 风险敞口的分析揭示了城市之间不同的趋势和变化，GN 城市的风险敞口通常较高，但随着时间的推移呈令人担忧的下降趋势，而 GS 城市则表现出混合模式。尽管面临独特的气候挑战，但干旱气候城市凤凰城和利雅得仍设法将 UGS 水平保持在较低但稳定的水平。城市化成为推动 UGS 下降的主导力量，GS 城市面临的压力明显高于 GN 城市。研究结果突出表明，迫切需要制定全面的城市绿化战略，这些战略优先考虑城市绿化系统的保护和扩展、创新政策、社区参与和数据驱动的决策，以促进公平和可持续的城市环境。本研究通过对不同城市的 UGS 轨迹和暴露平等影响进行比较分析，强调了因地制宜的方法和包容性规划过程的重要性，为日益增长的城市绿化研究做出了贡献。