Limiting the Magnitude of Future Climate Change
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UNITS USED (FOR ENERGY, POWER, MATTER)
J: joule. The energy of one watt of power flowing for one second
GJ: gigajoule, 109 joules
EJ : exajoule, 1018 joules
BTU: British thermal unit. The energy to raise the temperature of one pound of water one degree Fahrenheit.
quad: a quadrillion (a million-billion, or 1015 ) BTUs, equal to 1.055 × 1018 joules (1.055 EJ). A unit commonly used in discussing global and national energy budgets
W: watt, a unit of electric power (= 1 J of energy per second)
kW: kilowatt, a thousand (103 ) Watts
GW: gigawatt, a billion (109 )Watts
TW: terawatt, a trillion (1012) Watts
kWh: kilowatt-hour, or the amount of energy when one kW is used for one hour. Equivalent to about 3,400 BTU or 3,600,000 Joules
Metric ton (i.e., of CO2) is one thousand kilograms, or about 2,200 pounds
MMT: million metric tons of CO2
Mt: megaton, a million (106) metric tons
Gt: gigaton, a billion (109) metric tons
Tg: teragram, a billion (109)kilograms, or one million metric tons
ppm: parts per million, a measure of atmospheric concentration of some greenhouse gases
Barrel (oil): ~42 gallons. The United States uses about 20 million barrels of oil each day.