Is ethanol causing world hunger?

Ethanol is being made out of crop (food plants) for use as a biofuel (an alternative to fossil fuel for cars).

While this is a good thing for the planet because the carbon from biofuels is not adding to the carbon load in our atmosphere, using crops for biofuel manufacture means that some of the word's food is not available for people to eat. This seems to be causing food prices to rise and will exacerbate food shortages in times when the word has experienced a few years of poor harvests. Obviously the more that agricultural land is used for biofuel growth , there will come a point when it will cause world hunger directly.