Nutrient emission policies for multiple clean emissions goals based on water elemental balance - Yuxin Tian; Zhaohui Song; Xianghong Guan; Zhiyan Zheng; Xiaoqian Cheng; Zhi Qin; Haizhen Wu; Guanglei Qiu; Chunhua Feng; Yun Hu; Chaohai Wei (Environmental Research, 2026)