Where does carbon dioxide gas, which is a form of carbon, exist?

CO2 exist in the earth'a atmosphere as a gas and in its solid state it known as dry ice. Carbon Dioxide, CO2, exists as a gas at STP and is generally exhaled by animals and used by plants during photosynthesis. CO2 is a greenhouse gas because it absorbs ultraviolet rays from the sun.

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answer; i thinking 4.5 million. in sydney australia;