"When the study was conducted there were 6.7 billion people on Earth and that means that we then needed to eat food with a total energy content of 7,100 TWh per year - or, if we express it in oil-based units it is 12 million barrels oil equivalents per day."

did you include that I drove to work while the guy living in Rajestan building a freeway lives on the site?

I'm a simple person. Is he saying we shouldn't worry about CO2 emissions because ethanol will solve our problems?

"Those that call for zero carbon dioxide emissions by 2050 must first explain how an estimated 9 billion people will be fed."

This is a good point but also suggests he is does not buy the whole global warming thing which suggests where his head might be.

"You who blog and become instant experts and dismiss what we researchers say without regard to our research results should understand that a research report takes time to write"

He sounds like a curmudgeon yelling at kids on his lawn. This study also concluded it isn't smart to turn food into fuel, so no surprise there and other studies found that ethanol made from grains were a major contributor to the 2008 speculation spike by, hold onto your pants, creating an incentive to speculate. No serious study I have seen suggests that biofuels were the sole cause or not part of the cause. The only dispute is over how much they contributed and considering that they are in their infancy we had better start looking for alternatives to today's biofuels.