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  • Africa's Savanna Ecosystems

    Africa's Savanna Ecosystems

    Science Talks

    (24 min 56 sec) Savannas cover 20 percent of Earth’s surface and much of Africa. The patterns and processes that occur in this globally important biome illustrate core concepts in ecology.

  • Ocean Species Respond to Climate Change

    Ocean Species Respond to Climate Change

    Science Talks

    (29 min 39 sec) Coral reefs, how they are threatened by climate change, and how to protect them.

  • Biodiversity in the Age of Humans

    Biodiversity in the Age of Humans

    Science Talks

    Are we witnessing a sixth mass extinction? What factors threaten ecosystems on land and in the sea? What are researchers doing to try to conserve biodiversity and ecosystems?