Economic analysis of a multifactor-driven carbon reduction scheme for green and gray ammonia-coal co-firing. - Xiao, Yuhang; Cui, Jie; Pan, Honggang; Zheng, Zhaocong; Zhao, Honglei; Yang, Shuo; Fu, Yudong; Xu, Youning (Renewable Energy (1671-5292), 2026)