Miracle Planet: Snowball Earth - Methane
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Added February 16, 2008
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Over its more than
4-billion-year history, Earth
has been home to repeated
violent climactic changes,
which have caused mass
extinctions. And yet, life has
survived. In fact, these same
catastrophes that devastated
life on Earth also helped
bring about its evolution from
the simplest microbes to the
complexity and diversi
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