ABSTRACT
Fossil fuels Natural gasa 54 .0 23 .2 13 .9 Gasoline 46 .5 20 .0 17 .6 Kerosene 46 .4 20 .0 18 .5 Fuel oil 40 .9 17 .6 21 .3 Coal, high bituminous 36 .3 15 .6 23 .5 Coal, low bituminous 28 .9 12 .4 26 .3 Coal, anthracite 34 .6 14 .9 27 .3
Other materials Wood, oak 18 .9 8 .1 25 .3 Wood, locust 19 .7 8 .5 25 .7 Wood, Ponderosa pine 20 .0 8 .6 24 .6 Wood, redwood 20 .7 8 .9 24 .4 Charcoal, wood 34 .7 14 .9 26 .8 Newsprint 18 .6 8 .0 26 .5 Cellulose 17 .3 7 .5 25 .6 Grass (lawn clippings) 19 .3 8 .3 24 .9
