In another move from the city that loves plastics every three years -- for NPE -- Chicago is banning farmers' markets from using plastic shopping bags starting next year.

The story comes from our sister paper, Crain's Chicago Business, which reports that vendors at the city's 24 farmers' markets will be told later this week that they can't use plastic bags next year.

“This is part of the city’s message to go greener,” a spokeswoman for the Mayor's Office of Special Events told the paper. "We want to set a precedent that this is something we believe in."

The story notes that one farmer is questioning the new policy. Henry Brockman of Henry's Farm "questioned on his farm's Web site whether biodegradable bags are as environmentally friendly as marketed."

First a tax on PET water bottles, now a limited ban on plastic shopping bags. Does anyone else expect Mayor Richard M. Dailey may not get the warm welcome he's used to receiving at McCormick Place next summer?