legg lewis blayse says good. sled sled to start a leg of the leg. a. long. pole leg long lucky i am a leg length . most of the carbon that we mine from across the the earth is millions of years old coal particularly interesting because per unit of energy generated coal actually it may be the cheapest fuel but it also releases the most carbon to be with her as carbon dioxide beginning in earnest with the development of the steam engine in the late seventeen early eighteen hundreds he wins begin to. extract fossil carbon from the earth's crust coal oil natural gas even in the absence of humans over some time period it would be uplifted and subject to erosion and removal might return to the us here but those rates are tiny compared to the ability of humans to go out with large machines to deliver a large quantities of this material to the surface of the earth where it is burned in the useful generation of energy we have larger quitman it was introduced on surface minds about twenty five years ago here in washington which accounted for the the ability to recover