How do coal and petroleum deposits affect the long-term carbon cycle?

Coal and petroleum deposits represent carbon that was removed from the active carbon cycle millions of years ago and sequestered in Earth’s crust as fossil fuels. By extracting and burning these materials, human activity rapidly reintroduces this long-stored carbon into the atmosphere as carbon dioxide.123

This process significantly disrupts the long-term carbon cycle by overwhelming the capacity of natural carbon sinks—such as oceans and terrestrial vegetation—to absorb excess emissions. As atmospheric carbon dioxide concentrations rise, the gas acts as a potent greenhouse gas, trapping infrared radiation and leading to global warming. Because the rate of carbon release from fossil fuel combustion far exceeds the rate at which it was originally sequestered, this anthropogenic interference creates a persistent imbalance that alters the Earth's climate and atmospheric composition.2345