Where does carbon dioxide come from?

Answer 1

Carbon dioxide (CO2) is produced during respiration by all animals, fungi and microorganisms that depend either directly or indirectly on plants for food. It is thus a major component of the carbon cycle. When you breathe in oxygen (O) from the air around you, it travels through your body and is converted to carbon dioxide (CO2). This happens by the time you exhale. It is thus a product of metabolism of hydrocarbons plus oxygen by many organisms on earth including humans.

Carbon dioxide is generated as a by-product of the combustion of fossil fuels (coal, oil and natural gas) or the burning of vegetable matter, among other chemical processes. Carbon dioxide is the exhaust compound produced when carbon (or a hydrocarbon) burns and combines with oxygen.

Small amounts of carbon dioxide are emitted from volcanoes and other geothermal processes such as hot springs and geysers and by the dissolution of carbonates in crustal rocks. In the early days of earth's prehistory, much of the CO2 was probably derived from volcanoes which spewed out huge quantities of gases and minerals into the atmosphere.

CO2 is a greenhouse gas that, when in excess in the atmosphere, contributes to global warming. It is essential that we take urgent steps to reduce CO2 emissions.

All plants derive the carbon that they need from atmospheric CO2. Without atmospheric CO2, there would be no trees, grasses or vegetables. So vegetation, especially large forests, are very important for removing carbon from the atmosphere.
Carbon dioxide (CO2) is the exhaust compound produced when carbon (or a hydrocarbon) burns and combines with oxygen.

Answer 2

Carbon dioxide is produced naturally through processes such as respiration in animals and the decay of organic matter. It is also released through human activities such as burning fossil fuels like coal, oil, and gas, as well as deforestation and industrial processes.

Answer 3

it comes from carbon oxidizing through fire.

It also comes from a lot of other places. Carbon dioxide is a waste product of cellular respiration. It diffuses into the blood from the cells and travels to the lung where it is exhaled into the air.

Answer 4

Burning up fossile (hydro)carbon-fuels