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<p>Cities in the Global South face dual pressures from intensifying heat stress and widespread urban browning. However, the specific trends in urban heat stress across these cities, alongside those induced by urban browning, remain inadequately quantified, hampering effective urban planning and intervention strategies. Here we present a data-driven methodology to generate high-resolution (1 km) summertime Heat Index (HI) maps for over 2,300 Global South cities (2003–2020). This dataset recalibrates HI-based warming rates, revealing a mean trend (<i>K</i><sub>HI</sub>) of 0.41 ± 0.01 °C per decade (mean ± standard error) across these cities. Urban browning exacerbates heat stress significantly, with <i>K</i><sub>HI</sub> increases surpassing 0.05 °C per decade in cities such as those in Nigeria, contrasting starkly with greening-induced cooling observed in many Global North cities. Our analysis pinpoints cities in dire need of intervention, such as those in Botswana and Côte d’Ivoire facing browning-driven HI increases without commensurate economic growth. Contrastingly, Chinese and Indian cities exhibit a paradoxical cooling trend, potentially linked to greening initiatives amid economic development. Our findings highlight key action imperatives for South–South knowledge exchange to develop targeted governance strategies for achieving urban sustainability.</p>

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Exacerbated heat stress induced by urban browning in the Global South

  • 期刊论文

  • 发表日期：

    2025年1月6日

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  • Huilin Du,
  • Wenfeng Zhan,
  • Bingbing Zhou,
  • Yang Ju,
  • Zihan Liu,
  • Ariane Middel,
  • Kangning Huang,
  • Lei Zhao,
  • TC Chakraborty,
  • Zhihua Wang,
  • Shasha Wang,
  • Jiufeng Li,
  • Long Li,
  • Fan Huang,
  • Yingying Ji,
  • Xuecao Li,
  • Manchun Li

摘要

Cities in the Global South face dual pressures from intensifying heat stress and widespread urban browning. However, the specific trends in urban heat stress across these cities, alongside those induced by urban browning, remain inadequately quantified, hampering effective urban planning and intervention strategies. Here we present a data-driven methodology to generate high-resolution (1 km) summertime Heat Index (HI) maps for over 2,300 Global South cities (2003–2020). This dataset recalibrates HI-based warming rates, revealing a mean trend (KHI) of 0.41 ± 0.01 °C per decade (mean ± standard error) across these cities. Urban browning exacerbates heat stress significantly, with KHI increases surpassing 0.05 °C per decade in cities such as those in Nigeria, contrasting starkly with greening-induced cooling observed in many Global North cities. Our analysis pinpoints cities in dire need of intervention, such as those in Botswana and Côte d’Ivoire facing browning-driven HI increases without commensurate economic growth. Contrastingly, Chinese and Indian cities exhibit a paradoxical cooling trend, potentially linked to greening initiatives amid economic development. Our findings highlight key action imperatives for South–South knowledge exchange to develop targeted governance strategies for achieving urban sustainability.