1 The Importance of Ships and Spare Parts in LCAs of Offshore Wind Power Anders Arvesen*,Christine Birkeland and Edgar G. Hertwich Industrial Ecology Programme and Department of Energy and Process Engineering Norwegian University of Science and Technology (NTNU) *Corresponding Author: Email: anders.arvesen@ntnu.no Address: Industrial Ecology Programme, NTNU, NO-7491 Trondheim, Norway Phone: +47 73 59 89 46; Fax: +47 73 59 89 43 Citation This document contains an unedited manuscript for the following article: Arvesen, A., Birkeland, C., Hertwich, E.G., 2013. The importance of ships and spare parts in LCAs of offshore wind power. Environmental Science & Technology 47, 2948-2956. The final edited and published article is available at: http://dx.doi.org/10.1021/es304509r