| 11. | Missing was the carbon dioxide removal system built by subcontractor AlliedSignal.
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| 12. | However, Mars does have polar caps of frozen carbon dioxide.
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| 13. | That has reduced carbon dioxide emissions by 200, 000 tons.
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| 14. | You have cyanobacteria, which photosynthesize and so bring carbon dioxide.
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| 15. | But carbon dioxide is useful for a number of other purposes.
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| 16. | While carbon dioxide warms the atmosphere, sulfur dioxide cools it.
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| 17. | While carbon dioxide warms the atmosphere, sulfur dioxide cools it.
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| 18. | One factor is various possible levels of future carbon dioxide emissions.
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| 19. | Another technique is injecting carbon dioxide to force out additional oil.
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| 20. | As you get more and more carbon dioxide and less oxygen,
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