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This activity is about the impact of sea ice loss on walrus populations. Learners will participate in a discussion about walruses, their habitat requirements and the impact of sea ice loss. Throughout the discussion, learners will develop an understanding of the importance of collecting population data and of the difficulty of making policy decisions without these data. Learners will then use the data provided to graph the Pacific walrus population, while reviewing the concept of graphing. Extensions to this activity are available. This is the second of two activities in the "Impact of a Changing Climate on the Pacific Walrus" section of the "Climate Change, Wildlife and Wildlands: A Toolkit for Formal and Informal Educators."