RT Journal Article SR Electronic T1 Seafood Eco-Label Grapples With Challenge of Proving Its Impact JF Science JO Science FD American Association for the Advancement of Science SP 746 OP 746 DO 10.1126/science.334.6057.746 VO 334 IS 6057 A1 Stokstad, Erik YR 2011 UL http://science.sciencemag.org/content/334/6057/746.abstract AB