What is fast carbon?

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Carbon that moves slowly through the atmosphere
Carbon that gets stored in plants
Carbon that is found in fossil fuels
Carbon that is released by volcanic eruptions

Fast carbon refers to carbon that is released into the atmosphere quickly or has a short atmospheric residence time. It is often associated with human activities such as burning fossil fuels, industrial processes, and deforestation, which release carbon dioxide (CO2) and other greenhouse gases into the atmosphere. In contrast, slow carbon refers to carbon that cycles slowly through long-term processes such as the exchange of carbon between the atmosphere, oceans, and terrestrial ecosystems, or carbon stored in geological formations over millions of years.