Revealing spatiotemporal dynamics and obstacles of water–land–energy–carbon nexus in cities: a case study of the Yellow River Basin, China - Yufei Ji; Rongqin Zhao; Hanbing Li; Zhixiang Xie; Liangang Xiao; Shuangsheng Yao; Yaohui Gao; Haitao Chen; Weixi Ma; Xiaowei Chuai (Environment, Development and Sustainability, 2025)