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The atmosphere 400 to 290 million years ago is like what we have today. Oxygen levels have paved the way for life to grow and oxygen levels even peaked during this time at oxygen making up 35% of the environment.

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During this time, there was no atmosphere. it was simply a mix of methane, sulfide, hydrogen, and nearly 200 times the amount of carbon dioxide compared to today's atmosphere.

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The planet has cooled down, yet there is still no oxygen. The atmosphere is full of methane droplets. The first organisms also began to form in the ocean during this era as well. The necessities needed to live could be found in the oceans around the world during this time.

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After nearly 2 billion years, the organisms in the water began to produce enough oxygen for it to become prevalent in the atmosphere. It began to clear out the methane majority atmosphere, and soon the Earth got its blue sky that we know and love today.

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The atmosphere for the last 290 million years has been the same as it is today. Life is flourishing, temperatures are nice, but unlike the atmosphere variations before the one we are familiar with, we are heating the Earth up at an unnatural rate.