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  • Africa's Savanna Ecosystems

    Africa's Savanna Ecosystems

    Lecture

    (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.

  • Steve Palumbi & Megan Morikawa Study Coral Reef Damage in American Samoa

    Steve Palumbi & Megan Morikawa Study Coral Reef Damage in American Samoa

    Scientists at Work

    (7 min 1 sec) Field research on coral bleaching suggests possibilities for saving threatened reefs.

  • Ocean Species Respond to Climate Change

    Ocean Species Respond to Climate Change

    Lecture

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

  • Liz Hadly Tracks the Impact of Climate Change in Yellowstone

    Liz Hadly Tracks the Impact of Climate Change in Yellowstone

    Scientists at Work

    (7 min 28 sec) Ecosystems in the world-famous national park are threatened by warming temperatures.

  • Biodiversity in the Age of Humans

    Biodiversity in the Age of Humans

    Lecture

    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?

  • Interview with Julie Shoemaker, PhD

    Interview with Julie Shoemaker, PhD

    Interview

    (4 min 58 sec) A postdoc in the Schrag lab, Dr. Shoemaker works on the greenhouse gas methane, which has surprising natural and man-made sources.

  • Protect Our Winters

    Protect Our Winters

    Clip

    (1 min 57 sec) A grassroots effort by winter sports professionals aims to convince the government to take action on climate change.

  • Climate Discussion with Students

    Climate Discussion with Students

    Lecture

    (58 min 23 sec) A discussion on climate change with the students attending the 2012 Holiday Lectures on Science.

  • Climate Change: How Do We Know We're Not Wrong?

    Climate Change: How Do We Know We're Not Wrong?

    Lecture

    (58 min 29 sec) Scientific evidence for global climate change is overwhelming, yet the American public remains skeptical. History provides insights into how a Cold War-era think tank became an influential source of anti-regulation sentiment.

  • Earth's Climate: Back to the Future

    Earth's Climate: Back to the Future

    Lecture

    (1 hr 27 min 59 sec) Earth has been both cooler and warmer in the past, but the change is usually gradual. The current rate of carbon dioxide increase is unprecedented in human history, and solutions to mitigate its effect on global warming are challenging to implement.

  • Changing Planet: Past, Present, Future

    Changing Planet: Past, Present, Future

    Lecture

    Has Earth changed over deep time? How did Earth shape life and life shape Earth? What does Earth's climate in the distant past tell us about the future?

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