Carbon is returned to the atmosphere in a number of ways, including when animals perish, volcanoes erupt, fires burn, fossil fuels are burned, and through a number of other processes.
When organisms breathe or decay, weathering of carbonate rocks, forest fires, and volcanic eruptions all take place naturally, carbon dioxide is released into the atmosphere. Human activities like the burning of fossil fuels, clearing forests, and making cement all contribute to the atmosphere's increase in carbon dioxide. Burning hydrocarbon fuels, such as wood, coal, natural gas, gasoline, and oil, releases carbon dioxide into the atmosphere. Carbon from fossil fuels reacts with oxygen in the air to produce carbon dioxide and water vapor during combustion. Carbon is released into the atmosphere by living things. Carbon dioxide (CO2) is a gas that is released into the atmosphere each time you exhale. Through a process known as respiration, both plants and animals must get rid of carbon dioxide gas.
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