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Prof. Daniel Sigman, co-author of the study "Iron Fertilization of the Sub-antarctic Ocean During the Last Ice Age" (http://www.princeton.edu/main/news/archive/S39/53/29A19/index.xml?section=topstories), talks with Vancouver's CBC Radio One host Gregor Craigie on the scalability and viability of boosting salmon populations in coastal water off of British Columbia.