Mexico City is Western Hemisphere 's second large metro area to ban the practice . In Tanzania , selling the bags carries a maximum six-month jail sentence and a fine of 1.5 million shilling ( $ 1,137 ) . Move ##s as leading environmentalists call for global action . UN agency : Plastic bags are second - most common form of transportation . Bags a major threat to ocean wildlife , U.N. agency says .
Mexico City is Western Hemisphere 's second large metro area to ban the practice . Move ##s as leading environmentalists call for global action . UN agency : Plastic bags are second - most common form of transportation . Bags a major threat to ocean wildlife , U.N. agency says .