The increasing use of food grains in biofuels, rising meat consumption in Asia and perverse government farming subsidies are having a serious effect on global food security.
"Vulnerable regions of the world face the risk of famine over the next three years as rising energy costs spill over into a food crunch, according to US investment bank Goldman Sachs.
Corn can be used for ethanol in cars and power plants, for plastics, as well as in baking tortillas. Natural gas can be made into fertiliser for food output. "Peak Oil" is morphing into "Peak Food".
Land use for biofuels has shot up from 12m to more than 80m hectares worldwide over six years. Biofuel provides 3pc of global energy needs, which will rise to an estimated 10.6pc by 2030.
In a pure market, sugar cane would be the only viable biofuel with a cost of $35 a barrel (oil equivalent). The others are sugar beet ($103), corn ($81), wheat ($145), rapeseed ($209), soybean ($232), cellulose ($305).
Subsidies drive the business. The US offers tax relief of $1 a gallon for biodiesel. The EU has a 10pc biofuel target by 2010.
The crop switch comes just as China and India make the leap to an animal-based diet, replicating the pattern seen in Japan and Korea, where people raised their protein intake nine-fold as they became rich. It takes 8.3 grams of soya or corn feed to produce a 1g weight gain in cattle - compared with 3.1g for pigs, 2g for chicken and 1.5g for fish.
The current "supercycle" is a break with history because energy and food have "converged" in price and can increasingly be switched from one use to another."