Catch up TV

Series 1: 3. Green

Chris Packham tells the miraculous story of how plant life turned the Earth from a barren rock into a vibrant green world - a 4.5-billion year-saga of extraordinary highs and lows that almost wiped out all life on the planet.\n\nThe Earth began as a water world without land masses. Then, a giant asteroid bombardment triggered its 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.

Source: BBC 2