Well, first of all, we'll have to explain about the carbon cycle before explaining about fossil fuels. Does anyone know what carbon is and how it works?
Me! I heard that carbon is something needed for every organism on Earth!
And that carbon is passed from autotrophs to heterotrophs, in to soil or ocean, and back to the atmosphere!
Very good! To tell in detail...
Photosynthesis- 6Co2+6H20+Sunlight= C6H12O6+6O2
CO2 gets transferred to trees and plants through photosynthesis and gets consumed by organisms. Some organisms die and get decayed into the soil and goes back to the atmosphere by respiration and some live, produce feces which is broken down into the soil and brought back to the atmosphere by respiration.
Respiration- C6H12O6+602= 6C02+6H20+ATP
We've talked about the carbon cycle and now...
As our industry started developing from rustic to urban, the results were factories, vehicles, manufacturing and power industry, which required the burning of fossil fuels. In fact, 81% of the total energy source of US are fossil fuels!