Dunkin’ Donuts announced Wednesday that it is getting rid of polystyrene foam cups and replacing them with a new, double-walled paper cup.The chain said it plans to start eliminating the foam cups in its global supply chain beginning in the spring, with a targeted completion date of 2020.The new cups are already being used at Dunkin’ Donuts’ next generation concept store, which opened in mid-January in Quincy. The company said the cups will be introduced at all Dunkin’ Donuts restaurants in New York City and California in the spring and will be phased in across the U.S. as supplier manufacturing capabilities ramp up.Because foam packaging decomposes slowly, ends up in oceans and can harm marine life and other animals that ingest it, there has been push to ban its use. Dunkin' Brands Group, Inc., based in Canton, Massachusetts, joins other chain restaurants trying to diminish its footprint. McDonald's said last month that it would use only recycled or other environmentally friendly materials for its soda cups, Happy Meal boxes and other packaging by 2025.