It's an old argument with a new twist. Which is more important: economics or the environment? Some people criticize the Minnesota Pollution Control Agency for favoring economic development, and ignoring the potential for environmental damage. In the final part of our series on problems at the MPCA, Minnesota Public Radio's Mary Losure looks at charges that long term changes in the agency's philosophy are responsible for the growing list of environmental problems on its watch. 51:12 train. Birds etc.