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This activity is about sea surface temperatures and its impact on salmon populations. After reading background information on Northwest salmon and graphing data provided, learners will give short presentations about the relationship between sea surface temperature, the Pacific Decadal Oscillation and salmon populations. Links to materials and additional resources, as well as extensions to this activity, are provided. This the second of two activities on "The Impact of Climate Change on Chinook Salmon" in Climate Change, Wildlife and Wildlands: A Toolkit for Formal and Informal Educators.