The Dictionary of the Climate Debate (DCD)

CO2 concentration
Definition: A concentration is the amount of a substance in a given volume, thus CO2 concentration is a measure of the percentage of the atmosphere that is composed of CO2 (e.g., 380 ppm).

1. Don't get this confused CO2 emissions. Concentration is the amount that is in the atmosphere; emissions are what is emitted, and this doesn't necessarily stay in the atmosphere.

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