To convert CO₂ units to carbon, divide by 3.667. (CO₂/C = 44/12 = 3.667)

1 metric tonne (1,000 kg) = 1.1023 short tons
1 short ton = 0.9072 metric tonne.
1 kg = 2.2046 pounds
1 pound = 0.4536 kg.
1 mega = 10⁶
1 giga = 10⁹
1 tera = 10¹²
1 peta = 10¹⁵
1 exa = 10¹⁸
1 zetta = 10²¹.

1 kWh = 3.6 megajoules (10⁶ J) = 3,412 BTU. 1 Btu = 1,055 Joules.

1 petajoule = 10¹⁵ joules = 9,478 x 10¹¹ BTU = 163,400 "UN Standard" barrels of oil and 34,140 standard metric tonnes of coal.

Measurement in Joules is required for the purpose
 
 

^{World Resources Institute (1998), World Resources 1998-1999, notes to Data Table 15.1, p. 340.}