“Using Multivariate Gray Model to Predict CO2 Emissions and People Using Safely Managed Sanitation Services”. 2024. Journal of Al-Rafidain University College For Sciences ( Print ISSN: 1681-6870 ,Online ISSN: 2790-2293 ) 54 (1): 159-67. https://doi.org/10.55562/jrucs.v54i1.587.