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In the earliest formation of the Earth there was not even a atmosphere. The atmosphere was much more toxic, molten and fatal. Volcanoes spewed toxic gases which was composed of hydrogen, sulfide, methane and nearly two hundred times more carbon dioxide present in todays atmosphere. It took a couple billion years for the earth to cool and solidify enough to have water collect in the atmosphere.

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In the Archean Eon methane droplets shrouded the earth in a global haze. Oxygen gas was still not present in the atmosphere, only found in compounds like water. With complex chemical reactions occurring in the young oceans evolved carbon-containing molecules into simple single celled life forms that did not need oxygen to survive. 2.7 billon years ago blue-green microscopic organisms called cyanobacteria started to thrive in oceans. Cyanobacteria produced gaseous oxygen from carbon dioxide, water, and sunlight. Cyanobacteria kept producing more oxygen into the atmosphere.

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2.6 billion years ago to 400 million years ago 

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2.6 billion years ago to 400 million years ago 

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The evolution of life evolved with Earths atmosphere at the same time. Photosynthetic organisms were producing so much oxygen that it reacted with the methane present in the atmosphere. Around two billion years ago the methane haze cleared leaving the beautiful blue sky. For 300 million years the photosynthetic bacteria had been producing oxygen and  enough built up in the atmosphere, the oxygen oxidized with iron in rocks and soil to make reddish iron oxide and create vast expanses of redbeds. The late Proterozoic which was 700 to 550 million years ago the oxygen present in both the oceans and atmosphere had a enormous increase. 600 million years ago, oxygen was around 21 percent. The "oxygen boom" was flavorful to evolution of lifeforms that used oxygen to create energy. The other lifeforms that did not use oxygen were forced into extreme airless habitats or went extinct because the oxygen was poisonous to them. The burst and rapid increase of oxygen helped progress the burst of sea life in the Cambrian explosion, 530 to 509 million years ago which included the evolution of eurypterids and trilobites.

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Plants became established on land making the effect life has on the atmosphere during Carboniferous Period. Oxygen now is making up 20 percent of Earths atmosphere. 350 million  years ago it rose of even more to 35 percent for more than 50 million years ago.  318 to 299 million years ago massive forests grew on land and giant swaps filled low-lying areas. As large amounts of dead plant and or animal decay buried under swamps out of contact from oxygen the levels of carbon dioxide in the atmosphere dropped, cooling the earth. Millions of years of heat and pressure buried the remains of giant plants. Overtime they were turned into coal that we mine and use in present day. The Carboniferous Period the climate of Earth was warm. Overtime glaciers formed at the north and south poles. This lead to the climate having interglacial periods.

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The past 290 million years Earths climate was much warmer. Between 200 and 4r5 million years ago the polar ice caps were small are absent making winters much warmer around the globe. With the naturally warmer climate year round many plants and animals lived in the polar regions. The warmest part of the Earth in this specific area of time was the Eocene Epoch for 65 million years. During the early Eocene palm trees were growing up as far north in present day Canada and forests of dawn redwoods covered Elsmere Island near the North Pole. Alligators were swimming in the Arctic Ocean since it was not as cold. The Eocene is recent and many clues remain to tell scientists about he atmosphere and climate and the effect it had on Earth.