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We've presented a host of stories on ethanol over the past months, including those on production, impact on crops, how its used in today's fuel and other topics. For those who don't follow the subject every day, here's a capsule look at the pros and cons of ethanol and what it means to our nation's energy policy. Written by Matt Crenson of the Associated Press, the story defines the alternative fuel and puts its use into an up-to-date context. Check it out of you need to get caught up on the iss

Ethanol prices continue to rise, investors are enjoying tossing money hand over fist at ethanol producers, and somewhere in the melee a few voices are saying, "Um, perhaps we should think this through." Those voices were recently collected by Chicago Tribune writer James P. Miller, who found reason to think the heady ethanol boom may soon turn sour.