Forecasting annual CO2 emissions in Vietnam using ARIMA; Holt-Winters exponential smoothing modelsHuong Ta Thi, Huy D. Le, Trang Tran Y. Doan, Hien Nguyen Thi Thu and Duc Hoang ThanhE3S Web Conf., 643 (2025) 02001DOI: https://doi.org/10.1051/e3sconf/202564302001