Greenhouse Gas Emissions: Causes & Sources - Live …
When fuel is burned (which occurs anytime someone drives a vehicle), carbon dioxide (a ) is released into the . Carbon released into the atmosphere can be taken back in again by plants during . Carbon taken in, or sequestered, by plants can no longer participate in the atmosphere as a greenhouse gas. The release and sequestering of carbon is called the carbon cycle. It occurs on a global scale.
Energy - Royal Society of Chemistry
Large quantities of carbon pass between the atmosphere and biosphere on short time-scales: the removal of atmospheric carbon occurs during photosynthesis, following the reaction CO2 + H2O = CH2O + O2, while most carbon leaves the biosphere through respiration, a reversal of the previous reaction in which an amount of energy equivalent to that absorbed during photosynthesis is released as heat. When oxygen is present, aerobic respiration occurs, which releases carbon dioxide into the surrounding air or water. Otherwise, anaerobic respiration occurs and releases methane into the surrounding environment, which eventually makes its way into the atmosphere or hydrosphere.
Of sinks and sources.
During the natural carbon cycle, carbon is released into the atmosphere from various sources and absorbed through "sinks." For example humans and plants give off carbon dioxide through respiration, making them a source of carbon dioxide, while plants absorb carbon dioxide during photosynthesis, making them a sink. The ocean acts both as a source and a sink, releasing carbon dioxide and absorbing it through natural processes. Volcanic eruptions act as a natural source of CO2. However, the amount of carbon released through volcanic eruptions is relatively small.