Carbon dioxide, often written as CO2, is a molecule composed of one carbon atom covalently bonded to two oxygen atoms. Environmental Impact and Climate Relevance Natural sources of carbon dioxide include volcanic eruptions, the respiration of living organisms, and the decomposition of organic matter.
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While frequently discussed in the context of pollution and global warming, this compound is also a fundamental component of the carbon cycle, essential for photosynthesis and present naturally in the atmosphere, oceans, and geological formations. Conversely, during cellular respiration, both plants and animals break down glucose to release energy, consuming oxygen and expelling carbon dioxide as a waste product, thereby completing a key loop in the global carbon cycle.
The combustion of fossil fuels such as coal, oil, and gas for energy and transportation is the primary anthropogenic source, drastically increasing atmospheric concentrations beyond natural levels recorded over the past millennia. At standard conditions, it is a colorless gas with a faintly acidic odor and plays a critical role in the Earth’s climate system and biological processes.
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Under high pressure and low temperature, carbon dioxide can transition into a supercritical fluid, a unique state used extensively in industrial applications like decaffeination and dry cleaning. Sources in the Natural and Human-Driven Cycles Natural sources of carbon dioxide include volcanic eruptions, the respiration of living organisms, and the decomposition of organic matter.
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