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: The '''Earth's Atmosphere''' is essential to the survival of many [[Alive|living]] [[creature]]s creatures on the [[planet]].
: The '''Earth's Atmosphere''' has not always had the same proportions of [[gas]]es. 3.9 billion [[year]]s ago there was no [[Oxygen]] in the [[atmosphere]]. In the last 200 years humans have caused the [[Carbon Dioxide]] in the '''Earth's Atmosphere''' to double.