Chris Packham tells the miraculous story of how plant life turned Earth from a barren rock into a vibrant green world - a four-billion year saga of extraordinary highs and lows that almost wiped out all life on the planet. Beginning as a water world without land masses, a giant asteroid bombardment triggered Earth's plate tectonics, leading to huge fungi, soil and giant swamp forests. But the early plants locked so much carbon dioxide that global temperatures suddenly plunged.

James Tovell
Director

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Cast of this episode