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In this data analysis activity, Students will use longwave radiation data to determine whether the climate has changed in Portland, Oregon over a 20 year time span. This lesson offers two options: plotting data from Portland provided by the teacher, or following step-by-step instructions for use of the MY NASA DATA Live Access Server (LAS) which guide students through selecting a data set from a location of their choice, importing the data into a spreadsheet, creating graphs, and analyzing data plots. The lesson provides detailed procedures, related links and sample graphs, follow-up questions, extensions, and teacher notes. Designed for student use, MY NASA DATA LAS samples micro datasets from large scientific data archives, and provides structured investigations engaging students in exploration of real data to answer real world questions.