About this guide
The article “Mosses tell story of retreating ice” describes how radioactive carbon-14 dating of newly exposed mosses in the Arctic shows that summers are the warmest they have been in at least the last 40,000 years. This guide covers frozen mosses, carbon-14 dating and global warming, as well as related concepts. The activity invites students to explore exponential radioactive decay and half-life with a simulation using pennies, a chemical reaction using food coloring and bleach, and through students’ own calculations. The 2016 Shattered Earth’s Heat Record Educator Guide is another great resource for teaching about environmental change.
This Guide Includes:
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