環保問題是進入二十一世紀最重要的課題，食品工業因高用水量及高廢棄物量而對生態環境造成某些程度的衝擊，消費者選用綠色程度較高的食品有助於資源永續與環境永存，因此，在環保問題日受關切的現代，如何生產省能源、低汙染、及可回收的綠色食品，將會是食品工業重要的發展策略。本研究擬以國產果汁(柳橙汁、芭樂汁、楊桃汁及蕃茄汁)為對象，對其生物性材質的物質流向進行調查分析，蒐集相關盤查資料之後，採用生命週期評估的概念，以應用軟體Sima Pro為工具，對果汁環境衝擊進行分析比較，作為後續評估果汁產品生命週期及訂定綠色果汁製程管制點之基礎資料。以楊桃果汁為例，其生命週期評估中，楊桃原汁工廠的原汁製程部分，對環境衝擊的指標中以楊桃果實對環境影響最大，衝擊的類別是優氧化，電力使用次之，衝擊類別是酸化；果汁原汁的製造生產過程中，不論是柳橙汁、芭樂汁、楊桃汁及蕃茄汁，其對環境衝擊負荷對大的均是酸化，在原汁生產中電力的使用是主要的環境衝擊來源，尤其是蕃茄汁。下游製造果汁製程中，冷藏柳橙汁及芭樂汁的部分，其對環境衝擊的影響是以電力使用對環境的衝擊為最大。其他型態果汁的製程生命週期中，對環境衝擊的負荷類別以酸化為最高，衝擊來源則是運輸上所須耗用的能源為主，電力使用及原汁製造次之。在果汁製程上，能有效的減少運輸上所須耗用的能源及電力的使用，將有助於綠色製程的建立。
Environment protection has become a more and more important issue and should be taken much attention in all industries. The impact of food industry on the environment should also be taken into account. Foods processed with higher energy efficiency, fewer discharge and more recoveries, the so called green processing, is helpful to sustaining resources and protecting the environment. To establish the index for the greenness of local products, we used carambola, orange, guava and tomatojuice processing as model system to study the factors that affect the greenness of juice. To assess life cycle of juice and it's environmental impacts, the material flow in the life cycle of juice were put into the computer programs---Sima Pro. It consumed a large amount of water washing the recycled plastic contain. Effective washing or using aseptic container could solve this problem. Sterilization consume water much more than other unit processing. The prominent environmental impacts problems resulted from the producing juice is acidification. Impacts caused by electricity consumption was much higher than others. In summary, environmental impacts of the stock carambola juice factories were significantly higher than canned and Tetra Brik carambola products.
