There is no evidence that there is such a thing as clean coal. The ethanol industry (along with Iowa farmers) claims that those blaming ethanol for higher food prices ignore the fact that distillers grain is fed to livestock. When food prices escalated, it seemed to me more related to high oil prices (thus higher transportation costs) than increased ethanol (which should have decreased fuel prices).
More serious in the ethanol debate is the expanded use of land previously not tilled for corn production. It's going to cause desert conditions, as the Ogallala Aquifer is not being replenished.
Worldwide freshwater shortages are going to be serious.
Don't let the naysayers pretend that the rising oceans won't adversely affect poor people. Those really worried about food and energy shortages should look at the poor insulation of houses in warmer parts of the U.S. and the amount of food wasted here too.
Isn't it past time to get serious about the overpopulation problem? From what I've read, the answer to that is education of girls and women. The common wisdom about contraception and abortion of previous eras has been lost. Thomas Jefferson commented on the American Indian women giving birth to only children they could care for (until captured into slavery when they had as many children as the white women):
"They [Native Americans] raise fewer children than we do. The causes of this are to be found, not in a difference of nature, but of circumstance. The women very frequently attending the men in their parties of war and of hunting, child-bearing becomes extremely inconvenient to them. It is said, therefore, that they have learnt the practice of procuring abortion by the use of some vegetable; and that it even extends to prevent conception for a considerable time after."