Chris Packham Earth Series 4 Atmosphere - https://www.bbc.co.uk/iplayer/episode/p0fpwl25/earth-series-1-4-atmosphere 

When the Earth first formed from clouds of dust and gas 4.6 billion years ago, it was - like so many other lifeless worlds in the universe - devoid of an atmosphere, an inhospitable rock floating in the black void of space. But as the young planet is pummelled by asteroids, a period of extraordinary upheaval begins.