Carbon dioxide is an important part of the air we breathe both on Earth and in space. This backgrounder explains what carbon dioxide is, how it is measured and how it affects us both mentally and physically.

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Humidity is an important part of life on Earth and life in space. This backgrounder explains what humidity is, how it is measured and how it affects us both mentally and physically.

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Temperature is an important part of life on Earth and life in space. This backgrounder explains what temperature is, how it is measured and how it affects us both mentally and physically.

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