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Usually, but there's not as much as you might think, given its importance to the carbon-oxygen cycle of life on Earth. It averages about 400 ppm, or about 2/5 of 1% of the atmosphere (but this varies greatly in some areas, including dense human civilization). As a byproduct of fossil fuel combustion (greenhouse gas), it is under scrutiny as a major moderator of Earth's climate. Since it is soluble, the oceans may contain up to 50 times more carbon dioxide than the air.

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17y ago

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