Tourists collect waste on a beach in Phu Yen Province, south-central Vietnam. Photo: SuppliedLe Quy Tai, a local tour guide, said green tourism is a sustainable trend. Young people recycle waste into useful products in Phu Yen Province, south-central Vietnam. Xom Bien homestay in Phu Yen Province, south-central Vietnam arranges clearly labeled bins for waste classification. Similarly, in Quang Ninh Province, tourists can take part in a garbage collection tour on Co To Island.