You seem to be attempting to access an item that has been removed from the repository.
The item you are trying to access was a duplicate of:
Hoekstra, A.Y. and Mekonnen, M.M. (2012) Reply to Ridoutt and Hunag: from water footprint assessment to policy. Proceedings of the National Academy of Sciences of the United States of America, PNAS, 109 (22). e1425. ISSN 0027-8424