| How We Get Food |
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| How We Use Fossil Fuels |
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| How We Use Water |
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| How We Use Wood |
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| The Impact of Energy |
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| Map and Track Grasslands |
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| Chasing Comets, Asteroids, and Mysterious Space Objects |
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6.8 |
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| Using Renewable Energy |
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| What are Eco-Cities? |
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| Burning Out: Energy from Fossil Fuels |
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6.4 |
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| Leaving Our Mark: Reducing Our Carbon Footprint |
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6.6 |
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| Energy from Nuclear Fission: Splitting the Atom |
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7.0 |
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