• A Guide to the Energy of the Earth
  Energy is neither created nor destroyed — and yet the global demand for it continues to increase. But where does energy come from, and where does it go? Joshua M. Sneideman examines the many ways in which energy cycles through our planet, from the sun to our food chain to electricity and beyond.
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• Amphibian Avenger:Smithsonian Scientist
  Scientist Brian Gratwicke explains what's happening to Central American frogs and their importance to the ecosystem.
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• Crash Course Ecology: Hydrologic & Carbon Cycles
  Hank Green discusses how water and carbon cycle through the earth.
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• Crash Course Ecology: Nitrogen & Phosphorus Cycles
  Hank Green explains how the nitrogen and phosphorus cycles work.
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• Gray Wolves Return to California
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• Hank Green: 5 Human Impacts on the Environment
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• National Geographic: Keystone Species
  Article explains what a keystone species is and how it contributes to an ecosystem.
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• The Wolves of Yellowstone
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