what are the main sources of carbon dioxide on earth
Though only a small amount of the atmosphere is made of CO2, this is still a huge amount in weight and volume. It is reasonable to wonder what the major sources are. The greatest amount of carbon dioxide is locked up in plants, rocks, and the oceans. It should not be surprising that these each contribute more CO2 emissions than any other sources.
Carbon dioxide production. a) Carbon dioxide is released back to the environment by respiration of producers and consumers. c) Burning of wood and fossil fuels add considerable amount of carbon dioxide into the atmosphere. The estimated amount of carbon fixed by photosynthesis is nearly 7 x 10 1 3 kg / year.