Facts about the Carbon Cycle

1. 07

   Fossil fuel combustion releases approximately 37 gigatons of carbon dioxide annually into the atmosphere, representing roughly 90 percent of total human-caused carbon emissions in the carbon cycle.

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2. 06

   Volcanic eruptions release approximately 100 to 300 million tons of carbon dioxide annually into the carbon cycle, though this represents only about 1% of human emissions.

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3. 05

   Decomposing organisms in soil release approximately 60 gigatons of carbon dioxide annually back into the atmosphere, completing a critical nutrient-recycling loop in the carbon cycle.

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4. 04

   Ocean waters absorb approximately 2.4 billion tons of carbon dioxide annually, acting as the planet's largest carbon sink and moderating atmospheric CO2 levels in the carbon cycle.

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5. 03

   Permafrost in Arctic regions contains approximately 1,700 gigatons of frozen carbon that could be released as methane and carbon dioxide if thawed by climate warming.

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6. 02

   Tropical rainforests absorb approximately 2 billion tons of carbon dioxide annually through photosynthesis, making them crucial carbon sinks in the global carbon cycle.

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7. 01

   Atmospheric carbon dioxide concentrations increased from 280 parts per million in 1750 to 419 ppm in 2021, driven primarily by fossil fuel combustion in the carbon cycle.

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