Black humor

"There is, admittedly, a humorous side to the debate over biofuels. A story that involves rocketing pork prices in China, expensive Mexican tortillas and Philadelphian farmers feeding their livestock chocolate bars has enough comic material to keep an entire classroom in giggles. Yet this argument has a darker side, because the search by politicians for a way to bring down carbon emissions is driving up food costs and enouraging destruction of land."