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Title: Prehistoric Climate Change and Why It Matters Today
Url: https://learninglab.si.edu/collections/prehistoric-climate-change-and-...
Publisher: Smithsonian Office of Education
Description: If you’re looking for a science activity to help introduce environmental issues, or if you’re looking for fun and challenging real-world math problems, we invite you to take a look at this issue of Smithsonian in Your Classroom. In the lesson plan, the class does the work of a team of paleontologists studying a time of rapid global warming 55 million years ago. By examining fossils of leaves from various tree species, and by incorporating the findings into a mathematical formula, the students are able to tell average annual temperatures during this prehistoric time.


The method they practice is called “leaf-margin analysis,” which begins by determining the percentage of leaves that have smooth edges, as opposed to toothed, or jagged, edges. This number—the percentage—goes into an equation that gives the average temperature in Celsius. The higher the percentage of smooth leaves, the warmer the climate.


The leaf fossils were discovered by a Smithsonian paleontologist in the Bighorn Basin of Wyoming. It was a major find: the leaves were the first record of plant life from the rapid warm-up, called the Paleocene-Eocene Thermal Maximum (PETM). They showed, more clearly than any other fossils, the dramatic changes undergone by living things during a change of climate.


The PETM has taken on a topicality in recent years. It has been established that the warming resulted from releases of carbon dioxide comparable to human-generated releases in our time. Climate scientists have been turning to PETM experts for an understanding of what our own future might hold.
LC Classification: Geography. Anthropology. Recreation -- Anthropology -- Prehistoric archaeology
Science -- Physics -- Meteorology. Climatology -- History
Science -- Physics -- Meteorology. Climatology -- History -- General works
GEM Subject: Science -- Meteorology
Science -- Instructional issues
Science -- Informal education
Science -- Natural history
Key Concept: Meteorology -- Climate change
Resource Type: Collection
Reference Material
Instructional Material
Instructional Material -- Student Guide
Instructional Material -- Interactive Simulation
Instructional Material -- Instructor Guide/Manual
Format: Document -- PDF
Document -- HTML
Video -- Quicktime
Audience: Educator
Learner
Professional/Practitioner
Education Level: Middle School
Elementary School
Language: English
Access Rights: Free access
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Source: Scout Staff
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