It's an old argument with a new twist. Which is more important: economics or the environment? As new technologies have emerged, some people criticize the Minnesota Pollution Control Agency for favoring the economics of new ventures, and ignoring the serious environmental questions posed by evolving industries. Fishing enthusiasts with the state chapter of Trout Unlimited are monitoring construction of an ethanol plant in the southeast Minnesota town of Preston. In the second story of our weeklong series, Minnesota Public Radio's Art Hughes reports officials with the volunteer recreation group Trout Unlimited worry about possible damage to the nearby Root River--one of the state's premier trout streams. They charge the Minnesota Pollution Control Agency with lax permit enforcement and failure to recognize the Root as a valuable resource.