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Presentation from https://www.climategen.org/our-core-programs/climate-change-education/curriculum/our-changing-climate-for-grades-3-6/ Thank you to the National Wildlife Federation for giving permission to use slides from Climate Classroom. Hickey, Laura. (2007). Whats up with global warming? Retrieved October 10, 2007, from www.climateclassroom.org, www.nwf.org.
