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    Planet Earth
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    2. Planet Earth

    Planet Earth

    How many trees does it take to produce oxygen for one person? © iStock
    Planet Earth

    How many trees does it take to produce oxygen for one person?

    Heavy rains and mudslides devastate Peru during El Nino season (AFP/Getty Images)
    Planet Earth

    Is El Nino shielding us from climate change?

    Is atmospheric oxygen declining, and does it matter? © Sony DSC
    Planet Earth

    Is atmospheric oxygen declining, and does it matter?

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    Should we mine the seabed? © Getty Images
    Planet Earth

    Should we mine the seabed?

    Why does wind blow in gusts and not at a steady rate? © Getty Images
    Planet Earth

    Why does wind blow in gusts and not at a steady rate?

    How did Earth get its name? © iStock
    Planet Earth

    How did Earth get its name?

    What is smog and how can it be prevented? © Getty Images
    Planet Earth

    What is smog and how can it be prevented?

    How many man-made gases are destroying the ozone layer? © iStock
    Planet Earth

    How many man-made gases are destroying the ozone layer?

    Is The Great Wall of China really visible from space? © Getty Images
    Planet Earth

    Is the Great Wall of China really visible from space?

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    When will Earth become uninhabitable? © Getty Images
    Planet Earth

    When will Earth become uninhabitable?

    Is it possible to harness the power of falling rain? © Getty Images
    Planet Earth

    Is it possible to harness the power of falling rain?

    What makes icebergs flip over? © iStock
    Planet Earth

    What makes icebergs flip over?

    How much salt is there in the Dead Sea? © Getty Images
    Planet Earth

    How much salt is there in the Dead Sea?

    Climate change: is it too late for Pingu and pals? © Dee Boersma/U of Washington
    Planet Earth

    Climate change: is it too late for Pingu and pals?

    How long can a structure last in a desert before being swamped by sand? © iStock
    Planet Earth

    How long can a structure last in a desert before being swamped by sand?

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