npj Urban SustainabilityChina’s mega-city clusters grab water resources and carbon credit from vulnerable hinterlandsHongwei HuangMenglong FanXinshi ZhangShuyu ZhangXining ZhaoYong ZhaoYangzi ZhaoXuerui Gao2026-02-17Full textDOI https://doi.org/10.1038/s42949-025-00279-9