Six pounds [2.5 kg] of wheat costs him 20 cents to grow, but if burned, that quantity of wheat would produce about the same heat as a quart [1 L] of fuel oil, which costs 60 cents.
Lai izaudzētu divarpus kilogramus kviešu, zemniekam jāizdod 20 eirocenti, bet, sadedzinot šādu daudzumu kviešu, var iegūt apmēram tikpat daudz siltuma, kādu dod litrs šķidrā kurināmā, kas maksā 60 centus.