Green market ‘Bubble Bubble’ and used cell phone recycling campaign The Yonsei Volunteer Service Center and the Green Campus Committee directed the green market ‘Bubble Bubble’ campaign and the used-cell phone recycling campaign. The green market ‘Bubble Bubble’ was organized to collect second-hand clothes, bags, accessories, printer toners, etc. in order to raise money for families in need. The items were collected in front of the Central Library until May 28. The used cell phone recycling campaign, which is being run by the Ministry of Environment, collects used cell phones until June 30 on the first floor of the Central Library or in front of the Student Union Building.