PTT (Lao) Co., Ltd in collaboration with the Faculty of Economics and Business Administration describes the environmental impact of the waste problem Presented by Mr. Thanapon KAMOLTHANAKUL, Deputy Managing Director of Marketing, together with the PTT (Lao) Executive Board at the Faculty of Economics and Business Administration, National University of Laos. Encourage the new generation to pay attention to waste sorting to reduce the amount of garbage and can be used for maximum benefit.