D

Darcy, unit for permeability, 10-12 m2

ppm

Parts per million (106), mixing ratio (^mol mol-1)

ppb

Parts per billion (109), mixing ratio (nmol mol-1)

h

Hour

yr

Year

kWh

Kilowatt hour

MWh

Megawatt hour

MtCO2

Megatonnes (1 Mt = 109 kg = 1 Tg) CO2

GtCO2

Gigatonnes (1 Gt = 1012 kg = 1 Pg) CO2

tCO2 MWh-1

tonne CO2 per megawatt hour

US$ kWh-1

US dollar per kilowatt hour

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Guide to Alternative Fuels

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