Some of the CO2 given off from forest disturbance comes from decay, but the biggest source is from the disturbed soil. Although they accumulate carbon much more slowly than trees, forest soils ultimately become storehouses for enormous amounts of carbon, over twice as much as is stored in the wood of the trees.
http://www.dec.ny.gov/lands/47481.html
The carbon cycle is one of the major biogeochemical cycles describing the flow of essential elements from the environent to living organisms and back to the environment again. This process is required for the building of all organic compounds and involves the participation of many of the earth's key forces.
http://dilu.bol.ucla.edu/home.html
Because carbon dioxide is thus immediately processed in the sea, the CO2 capacity of the oceans is ten times higher than that of freshwater, and they therefore can absorb large quantities of it. Scientists refer to this kind of assimilation of CO2 as a sink.
http://worldoceanreview.com/en/wor-1/ocean-chemistry/co2-reservoir/
Carbon Monoxide Sources in the Home. In simple terms, CO is produced whenever a material burns. Homes with fuel-burning appliances or attached garages are more likely to have CO problems Common sources of CO in our homes include fuel-burning appliances and devices such as:
http://www.health.state.mn.us/divs/eh/indoorair/co/
The major sources for carbon dioxide emissions. Carbon dioxide is a common gas that comes from primarily natural sources, when a carbon atom combines with an oxygen molecule. It makes up a small, but important part of our atmosphere, which is primarily nitrogen and oxygen.
http://carbonoffsetsdaily.com/news-channels/global/the-major-sources-for-carbon-dioxide-emissions-40831.htm
Carbon monoxide (CO) is an odorless, colorless gas formed by the incomplete combustion of fuels. When people are exposed to CO gas, the CO molecules will displace the oxygen in their bodies and lead to poisoning. Since CO has no odor, color or taste, it cannot be detected by our senses.
http://www.health.state.mn.us/divs/eh/indoorair/co/
The complexities of the carbon cycle are depicted in the diagram below: The carbon cycle is one of the earth's fastest recycling processes--each atom of carbon has been recycled numerous times. For this reason, the carbon cycle has no specific beginning or ending point on the diagram. The carbon cycle passes through three main stages: reservoirs, assimilation, and release.
http://dilu.bol.ucla.edu/home.html
That is enormous compared to other sources of emissions, excluding volcanic eruption. (US Forest Service; western fire suppression center, Boise, ID) The next biggest emitter of carbon dioxide is probably the ocean. It absorbs a great deal of the gas, however, the colder it is, the more it can hold. The bottom of the ocean contains water that is below the freezing point, but salinity and pressure prevent it from freezing.
http://carbonoffsetsdaily.com/news-channels/global/the-major-sources-for-carbon-dioxide-emissions-40831.htm
2.3 > Cement plants like this one in Amsterdam are, second to the burning of fossil fuels, among the most significant global sources of anthropogenic carbon dioxide. The potential for reducing CO2 output is accordingly large in these industrial areas.
http://worldoceanreview.com/en/wor-1/ocean-chemistry/co2-reservoir/
> The oceans absorb substantial amounts of carbon dioxide, and thereby consume a large portion of this greenhouse gas, which is released by human activity. This does not mean, however, that the problem can be ignored, because this process takes centuries and cannot prevent the consequences of climate change.
http://worldoceanreview.com/en/wor-1/ocean-chemistry/co2-reservoir/
what holds the largest source of carbon
Soil holds the largest source of carbon.  Soil holds the largest source of carbon.