S-Oil President Ryu Yeol joins the “Zero Disposables Challenges,” an environmental initiative launched by Environment Minister Han Hwa-jin in February to reduce the use of disposables in public. A number of key business leaders have participated in the campaign. Ryu named Lotte Data Communication CEO Roh Jun-hyung and Kumho Petrochemical CEO Baek Jong-hoon as the next participants. (S-Oil)