How Did We Get Our Atmosphere?

Our atmosphere came from all the various eruptions on the earth. Different organisms recite in various chemicals from the atmosphere. Apart from that, atmosphere is replenished by absorbing commentrails and volcano emissions. I think they say mars used to have an atmosphere. Maybe we stole mars atmosphere here, have it onearth. It's not some like, weird, abstruse topic that only physicists wake up late at night thinking about. And these days, with all the discussion of global warming and climate change, it's something that people really do think about.