How does carbon enter into the air?

Question

How does carbon enter into the air?

Answer 1

worst culprits - industries burning fossil fuels

Answer 2

Either as the result of incomplete combustion as in burning coal, wood or gas.

Or as a by product of digestion where living organisms, people and animals, consume foods containing carbon atoms and convert the carbon atoms into CO2 molecules which are expelled with each breath.  Methane is also released in the same process.  Animals actually release more greenhouse gases into the atmosphere than vehicles and power plants.

Answer 3

respiration, volcanoes, forest fires, human casues

Answer 4

cow f**t

Answer 5

Bonded to other elements such as oxygen, and hydrogen.