Queensland's coal seam gas reserves were written down by 1341 petajoules last year, more than all the gas estimated in the Cooper Basin, according to the annual reserves estimate by consultancy EnergyQuest, released exclusively to The Australian Financial Review. (afr.com)
Three centuries later, in 1850 — 9, energy consumption had risen to 1,833 petajoules, a total more than 28 times as large as the earlier figure. (energyskeptic.com)
In 1560 — 9 the annual average figure was 65 petajoules, a quantity roughly equivalent to the energy contained in 2.2 million tons of coal. (energyskeptic.com)