Table A.1 Units of measurement
Table A.2 Quantitative abbreviations
The most commonly used large units in this book are EJ (exajoules, 1018J), Gm3 (billion cubic meters), Gt (billion tonnes) and GW (billion watts), Mha (million hectares), Mt (million tonnes) and MW (million watts), and TWh (trillion watthours). The terms kgce and Mtce stand, respectively, for kilograms and millions of tonnes of coal equivalent, the fuel containing 29MJ/kg, compared to 42MJ/kg for crude oil, 35MJ/m3 for natural gas, and between 15 and 18GJ/t for biomass fuels.