Define Irony in the context of carbonated beverages

Rising demand for ethanol, combined with insane subsidies means that a third of corn produced in the US is now being used to make fuel. This has caused the price of corn syrup, commonly used as a cheaper and much less healthy replacement for sugar, to skyrocket. Manufacturers of soft drinks and other sweetened products are now considering switching to cane sugar as an "alternative". And to pile irony upon irony, cane sugar is a much more suitable source of fuel than corn.