January 2021

Chapter One: Introduction ________________________________________ 1.1 General Today, most1of the1energy we1used comes1from1fossil’fuels. /Oil, natural1gas, ’and/ coal’ are/ all/ fossil ’fuels [1].’While 1fossil1fuels are still/being1created/today1by underground heat1and pressure they are1being consumed more rapidly than are created. For that reason, fossil1fuels/are/considered non/renewable; that1is, they/are1not replaced1as soon1as