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Carbon Management (2005)
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Carbon Dioxide (CO2) is fundamental for life on Earth. Human beings exhale CO2 as a waste product when they breathe, but plants absorb it in the life-sustaining process of photosynthesis—which human beings depend for the food we eat. CO2 is also a naturally occurring greenhouse gas (not the most efficient such gas but certainly the most abundant); its presence in the atmosphere moderates Earth’s average surface temperature and keeps nighttime temperatures from plunging to extreme cold.
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