Carbon dioxide exists in the Earth’s atmosphere at a concentration of approximately 0.04 percent (400 parts per million) by volume. It is produced from human and animal respiration, volcanoes, hot springs, and geysers, and the burning of coal, petroleum, and natural gas, which are commonly known as fossil fuels.
Carbon dioxide is the fourth-most abundant compound in the atmosphere at 0.04 percent. Nitrogen and oxygen are the most abundant compounds at 78 percent and 20.9 percent, respectively. Meanwhile, carbon dioxide is the most abundant gas in the atmospheres of Mars and Venus.
Two significant natural sources of carbon dioxide are volcanos and wildfires. Respiration, the process by which organisms convert food into energy, releases carbon dioxide. The combustion of coal, petroleum, and natural gas, including internal combustion engines, also emit carbon dioxide.
Common products that use pressurized carbon dioxide include bicycle tires, life jackets, and paintball guns. Carbon dioxide is used to produce soda pop and is created by yeast during fermentation in the production of alcoholic beverages. Because it is inflammable, carbon dioxide is used in some fire extinguishers.
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