Glossary
Abbreviations boe = barrel of oil equivalent CCS = carbon dioxide capture and storage CO2 = carbon dioxide Gt = gigatonne kWh = kilowatt hour mbd = million barrels per day mt = metric tonne ppm = parts per million by volume International System (SI) of units MJ = megajoule = 106 joule GJ = gigajoule = 109 joule EJ = exajoule = 1018 joule Conversion between units 1 boe = 5.63 GJ* 1 mbd = 2.05 EJ/year 1 million cubic metre gas = 34 700 GJ* 1 tonne coal = 25 GJ* 1 kWh = 3.6 MJ * T his is a typical average but the energy content of a particular carrier may vary.
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