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Phytoplankton (bright blue) constantly remove carbon dioxide from the atmosphere and help to stabilize Earth's climate.
Courtesy of NASA Earth Observatory.


Ecosystems, communities, populations, energy transfer (food chains and webs), soil science, conservation

  • Ecosystems


    Overview of the relationships between environmental systems and life on our planet, including common terms and concepts related to ecosystems.

  • Population Ecology

    Population EcologyPresentation

    Evan Seimann, PhD, defines key terms and concepts of ecology, and explains the dynamics of different organisms within a population.

  • The Environment and Human Health

    The Environment and Human HealthPresentation

    Learn how the environment impacts human health and the ecosystems around us, on both a small/local and large/global scale.