The atmosphere was thin, dry and made mostly of carbon dioxide.

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Dr Lackner's version uses layers of Teflon or paper covered with a resin that absorbs carbon dioxide when dry and gives it up when moist.

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An annual winter chills the southern hemisphere, creating around the pole a frost composed in large part of frozen carbon dioxide, or dry ice.

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The Federation Aviation Authority limits how much dry ice can be on a plane because it releases carbon dioxide (too much can harm passengers and crew).

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