台灣溫室氣體的排放量一半以上來自電力的供給。根據教育部近年來統計各級學校電力之總用電量,其中大專院校所占的比例相當高。因此,節能減碳、環保列已是大專院校校務評鑑中重要的評鑑項目之議題。本研究針對朝陽科技大學作碳足跡調查,其結果可為學校推動節能減碳成果之檢驗,以及相關改善策略之參考。 研究結果顯示,朝陽科技大學99年度總溫室氣體總排放量為9669.26 t-CO2e。CO2排放量為9130.08 t-CO2e,占總排放量94.42 %;CH4排放量為537.05 t-CO2e,占總排放量5.56 %;N2O排放量為2.13 t-CO2e,占總排放量0.02 %。 範疇一溫室氣體的排放(658.46 t-CO2e,占總量6.81 %),主要來自化糞池甲烷的產生(536.13 t-CO2e);範疇二溫室氣體的排放(8193.72 t-CO2e,占總量84.74 %)來自外購電力的排放;範疇三的溫室氣體來自委外商店外購電力與師生通勤交通工具使用的排放(817.08 t-CO2e,占總量8.45 %),委外商店電力排放56.35 t-CO2e 、師生通勤交通工具約排放747.35 t-CO2e 。 在所有溫室氣體排放源中,外購電力所造成的排放量最大(8250.07 t-CO2e,85.32 %)、其次為師生通勤交通工具的使用(747.35 t-CO2e,7.73%)、化糞池甲烷的產生再次之(536.13 t-CO2e,5.54%)。 在碳吸存效益的統計上,學校校地面積廣達66.4公頃,第一期校地植栽喬木2421株,可吸存CO2 94.47公噸;灌木68176株,可吸存CO2 127.83公噸;草地綠化面積約111460m2,可吸存CO2 46.81公噸;第二、三期校地(合計47.95公頃)之天然林,可吸存CO2 719.25公噸;土壤的吸存量約是植物的1.38倍,約可吸存1363.50公噸。本年可吸存CO2的量達2351.88公噸,可扺減排放量的24.32%,這對於碳中和是有極大的貢獻。
It was estimated that more than half of greenhouse gas (GHG) emission came from electricity supply in Taiwan. It was also reported that electricity consumption of universities accounted for a high ratio among all various schools. Thus, energy saving, carbon reduction and environmental protection have became the important issues in performance evaluation systems. This study investigated the carbon footprint of Chaoyang University of Technology (CYUT) that can be used for strategy decision making in energy saving and carbon reduction in CYUT. Results showed that total GHG emission was 9669.26 t-CO2e in 2010. Among them, CO2 emission accounted for 9130.08 t-CO2e (94.42 %).CH4 emission accounted for 537.05 t-CO2e (5.56 %). N2O emission accounted for 2.13 t-CO2e (0.02 %). GHG emission of scope 1 came mainly from CH4 produced from septic tank (658.46 t-CO2e, accounting for 6.81 %). GHG emission of scope 2 came mainly from purchased electricity (8193.72 t-CO2e, accounting for 84.74 %). GHG emission of scope 3 was produced by cooperative restaurants and vehicles at schools (817.08 t-CO2e, accounting for 8.45 %). Cooperative restaurants accounted for 56.35 t-CO2e while vehicles at schools accounted for 747.35 t-CO2e. Among emission sources, purchased electricity showed the highest amount around 8250.07 t-CO2e( accounting for 85.32%). Vehicles at schools (747.35 t-CO2e, 7.73%) showed the second and septic tank CH4 (536.13 t-CO2e, 5.54%) showed the least. For carbon sequestration, the first phase of school land (66.4 hectares) had 2421 trees responsible for 94.47 tons CO2 uptake while that had 68176 shrubs corresponding to 127.83 tons CO2 adsorption. The 111460 m2 grass area was responsible for 46.81 tons CO2 adsorption. The second and three phase of school land (47.95 tons) contained natural trees which showed to have the adsorption capacity of 719.25 tons CO2. Compared to plants uptake, soil sequestration of CO2 was 1.38 times of plants corresponding to 1363.50 tons CO2. It was estimated that total CO2 sequestration was 2351.88 tons accounting for 24.32% reduction in this year. This result was beneficiary to the carbon neutral in Chaoyang University of Technology.