An estimated 1,900 trees have been saved thanks to action by 100 secondary schools - they dumped their old telephone directories into recycling bins. A competition involving recycling the old phone books was organised by the Conservancy Association, Hongkong Telecom and Telecom Directories. The aim was to get the environmental message across to young people. Students were joined in their recycling efforts by staff at 37 hotels and residents of a public housing estate. The project ran for three months, starting in January. Directories collected weighed a total of 116 tonnes. Lo Wai-yan, executive secretary of the Conservancy Association, told Young Post that most students seemed to understand the importance of recycling. The association sent questionnaires to 300 secondary schools and found about 120 had already installed recycling bins. 'We're impressed by their enthusiasm, but some of them still lack environmental awareness,' said Mr Lo. 'We need to give them more education or technical assistance to help them promote the environmental message.' The local conservation group's research revealed most students had cultivated a habit of recycling used papers. Competition winners picked up trophies and the top seven schools received certificates. RESULTS: Tseung Kwan O Government Secondary School (champion) collected 3.7 tonnes of old telephone directories and used paper; Pui Tak Canossian College (first runners-up) collected 3.4 tonnes of old directories and paper; Tuen Mun Government Secondary School (second runners-up) collected three tonnes of old directories and paper. The top seven schools were: Queen's College Old Boys' Association Secondary School, Tak Nga Secondary School, Tin Ka Ping Secondary School, NT Heung Yee Kuk Yuen Long District Secondary School, Holy Family Canossian College, Carmel Bunnan Tong Memorial Secondary School and Ng Yuk Secondary School.