Makes up 367 parts per million of our atmosphere - 95% comes from natural sources and the rest from human sources - Only 5% comes from human activities... snthropogenic (man made) - Very stable molecule and can last in the atmosphere for more than

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1. Makes up 367 parts per million of our atmosphere - 95% comes from natural sources and the rest from human sources - Only 5% comes from human activities... snthropogenic (man made) - Very stable molecule and can last in the atmosphere for more than