There is abundant evidence of major volcanic eruptions 4 billion years ago, which would have released carbon dioxide, nitrogen, hydrogen sulfide (H2S), and sulfur dioxide (SO2) into the atmosphere.
Postoje dokazi o velikim vulkanskim erupcijama prije četiri milijarde godina, koje bi mogle ispustiti ugljikov(IV) oksid, dušik, sumporovodik (H2S) i sumporov dioksid (SO2) u atmosferu.