由於氫能源具有下列多項優點：可降低對化石燃料的依賴性、可集中處理能源生產過程所造成的環境衝擊、可將氫能源用於能源轉換裝置(例如燃料電池)等，目前已成為極具發展潛力之替代能源載體之一。
就環境觀點而言，氫能源之不同生產階段所產生環境衝擊應納入計算。雖然目前已有許多文獻探討氫能生產及使用之相關議題，然而如何達成對環境友善之氫能社會的綜合評估方法仍尚待建構。因此，本研究的目的為提供決策者一個綜合評估方法，即複合生產及使用技術所需之策略性評估，藉此可做為未來氫能社會之規劃依據。
一個未來氫能社會所需之適當的氫氣量，是取決於於生命週期觀點所評估之環境衝擊結果。在本研究中，氫能之生產曲線(Production curve)、使用曲線(Utilization curve)及衝擊曲線(Impact curve)被定義：生產曲線是由各種氫能生產技術(ｘ軸)之累積產量及環境衝擊(y軸)所構成，而使用曲線則由各種設備之累積氫氣需求量(ｘ軸)和可降低之環境衝擊潛能(y軸)構成。藉由加總生產及使用曲線，可形成一衝擊曲線。此衝擊曲線可顯示在某氫能利用量下之淨環境衝擊量。
案例分析利用本研究建構之方法，來評估台灣氫能使用之運輸系統於溫室氣體排放量的改變。於此案例可求得最大環境衝擊量、必然可達污染減量之氫氣使用量，以及最大汙染減量潛能。
在本研究中，此複合性生命週期評估方法被建立用以提供決策者在引進氫能科技所需之策略性評估，並提供研究者發展新科技的評估方法，來達成效率及環境效益之提升，與評估平臺之回饋效應的可能性。
藉由收集更多氫能相關技術之數據，我們可藉此建立一個氫能分析的評估平臺。也就是，利用不同的標準及限制，藉此評估出未來最佳可行之氫能社會。

The use of hydrogen as alternative energy carrier has been receiving attentions due to its various advantages: ex. breakaway from dependency on fossil fuels, decentralized energy systems for secure supply and with less transportation, centralization of emissions of pollutants at the hydrogen production stage, and the availability of efficient energy conversion devices such as fuel cells. From environmental point of view, the impacts induced by emissions and consumption at different life cycle stages of hydrogen should be taken into consideration. Although there is a wide spectrum of growing literature exploring different possible production and utilization pathways of hydrogen, a comprehensive analysis method on achieving environmentally- friendly hydrogen society is still absent.
Therefore, the objective of this study is to present an assessment method that allows decision-makers analyze consequences of introduction of related technologies in a strategic manner when designing the future hydrogen society. The method needs to allow assessment of a composite of production and utilization technologies that build up the envisioned hydrogen society.
Using the novel methodology termed composite life cycle assessment, a possible future hydrogen society with appropriate hydrogen amounts based on a chosen set of technologies will be assessed from environmental life cycle perspectives. First, Production and Utilization curves are constructed by accumulating impacts associated with a technology over hydrogen supply and demand respectively. Each technology makes up one segment in the curves, taking resource availability and service demand into account. Next, the two curves are added over envisioned hydrogen utilization to synthesize an Impact curve.
Case studies on assessment of changes in greenhouse gas emission induced by hydrogen-based transportation systems in Taiwan are conducted by using the methodology presented. The results of maximum environmental impact hydrogen, utilization amount of absolute emission reduction and maximum emission reduction were calculated.
The composite life cycle assessment method is developed to allow decision-makers conduct strategic analyses on aware choice of hydrogen technologies. The presented case studies demonstrate the use of methodology, and shows possibility of feedback on target efficiencies and consequential environmental benefits to the researchers developing the technologies assessed.
By collecting more data on wider variety of hydrogen related technologies, an assessment platform for hydrogen platform can be constructed. It is recommended that such a platform be constructed to make the most of the technological assets generated as a result of research activities. As a result, the platform enables optimization of possible future hydrogen society using various criteria and constraints.
Keywords: Composite LCA, Hydrogen technologies, Taiwanese hydrogen society, Transportation sector 

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