圖書典藏及影音數位平台

為能審慎評估全球氣候變遷可能造成之衝擊及研擬相關調適策略，詳予考慮我國國情、體制、資源、與研發及實務工作之人力及本署應有作為，本署業已於98年度執行完成「氣候變遷對水環境之衝擊與調適研究計畫」第1階段管理計畫，規劃於四年內(99~102年)推動「氣候變遷對水環境之衝擊與調適研究計畫」科技研究發展專業計畫(以下稱主計畫)，以為本署因應全球氣候變遷可能對水資源、旱災、防洪及海岸防護等掌理事項造成之衝擊及其調適策略奠定基礎。 本分項計畫為主計畫中之分項計畫之ㄧ，其目的係透過水足跡之先期研究，檢視台灣地區水足跡之永續性及水資源政策之合理性，並研析未來推動產品水足跡標示之可行性。

The main purposes of this study are (1) reviewing the literature on ecological footprint and carbon footprint; (2) collecting the information of water footprint development status; (3) investigating the needed data for calculating national and regional water footprint; (4) calculating national water footprint and regional water footprint, and in the meantime, choosing rice crop, sugar cane, banana, milk-fish, and hog for case studies; (5) applying the concept of water footprint in making water policies under climate change, and (6) drawing up strategies for thrust of water footprint labeling. Due to recognition of the increasing importance of water resources, some international organizations and companies have involved in water footprint studies. In particular, the Water Footprint Network has published two versions of the water footprint assessment manual. In which, the product water footprint is defined as the direct and indirect fresh water consumption in the production process. Water footprint consists of three components: blue, green and grey water footprints. The blue water footprint refers to consumption of blue water resources (surface water and groundwater) along the supply chain of a product. The green water footprint is the consumption of green water resources. The grey water footprint is defined as the volume of freshwater which is required to assimilate the load of pollutants. This study uses the hybrid input-output tables to compute the blue water footprints within Taiwan for years 2001, 2004, and 2006. In addition to the national water footprint, this study also applies a multi-regional input-output table to estimate the water footprint of four regions in Taiwan. The results show that the drier region has a bigger water footprint. Defining the scope of product water footprint as the direct water consumption in the production process, this study suggests the principles and methods for computing the water footprint of rice crop, sugar cane, banana, milk-fish and hog. In computing water footprint for manufacturing products, this study also suggests applying the concept of carbon footprint recommended by PAS2050, i.e., computing the water footprint based on the 3-scope framework . Although the international standard has not been set for water footprint assessment, companies have been put in pressure by international counter-partners to disclose the information of water use for their products. Thus, it is expected that the government can take steps in helping out the private sector, in terms of establishing an assessment guideline, building up data needed for calculation, and issuing label of water footprint, and so on. Finally, this study suggests that government can help to form a private organization being in charge of promoting the concept of water footprint, and related matters.