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To help compare different orders of magnitude we list here energies between 1022 joules and 1023 joules. Weaker energies 2.6 × 1022 J -- energy in world's estimated coal reserves (2003) 3.6 × 1022J -- 10,000,000 TWh 3.9 × 1022 J -- energy in world's estimated total fossil fuel reserves (2003) Stronger energies External link Conversion Calculator for Units of ENERGY (http://www.ex.ac.uk/cimt/dictunit/ccenrgy.htm)