Carbon cycle. Diagram illustrating the global carbon cycle (red arrows). The yellow arrow represents sunlight, used by plants such as trees to incorporate atmospheric carbon dioxide into plant sugars and tissues during photosynthesis. Carbon dioxide is released during plant and animal respiration, and from oceans and volcanoes. Some carbon dioxide is also absorbed by the oceans. Organic matter decays in the soil, or forms fossil fuels, used in industries and resulting in the release of atmospheric carbon dioxide. These carbon reservoirs, forming the global carbon budget, are termed the biosphere, geosphere, hydrosphere, and atmosphere.
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