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The last ice age ended only a few thousand years ago, but there were earlier periods when the entire world was frozen, periods known as snowball Earth.

Episode 5 walks us down the incredible pathway that has brought humans to their dominant position on the planet and openly questions our role in the future development of life on Earth.

There was a moment in Earth's history, about 250 million years ago, when all life nearly disappeared from the planet. Scientists now believe the cause was an eruption of the Earth's molten core that triggered the climate change.

For billions of years, life existed only in the Earth's oceans. But about 350 million years ago, some of those earliest life forms began to explore new frontiers on land.

This film reveals the startling earliest history of life on Earth - its microscopic manifestations and the unimaginable challenges to it's survival.