Mexico City is Western Hemisphere 's second large # ##polis to ban the practice . The bags are also a major threat to ocean wildlife , causing the deaths of 100,000 sea turtles and other marine animals that mistake them for food . Move comes as Mexican environmentalists call for global ban . U.N. agency : Plastic bags are second - most common form of litter . Bags a major threat to local wildlife , U.N. agency says .
Mexico City is Western Hemisphere 's second large # ##polis to ban the practice . Move comes as Mexican environmentalists call for global ban . U.N. agency : Plastic bags are second - most common form of litter . Bags a major threat to local wildlife , U.N. agency says .