The city of San Francisco has passed the largest ban yet on the sale of products made from polystyrene, the material commonly used to make items like packing peanuts and disposable cups and plates.

In an effort to build on the goals of zero waste by 2020, San Francisco officials have . This includes takeout containers, packing materials, coolers and other similar containers, pool or beach toys and dock floats.

This is a huge coup for environmentalists that have been , Mother Jones reports. Though polystyrene reportedly never completely breaks down in landfills, it can decompose in oceans. The material breaks down into small, lightweight pieces that are easily blown into the sea, where birds and fish mistake them for food.

A study published in the Marine Pollution Bulletin in 2010 reports that about , with an average of 2.1 pieces per fish.

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Not everyone is happy with the ban. According to The New York Times, in April 2015, to stop the ban. They argued that it is possible to recycle the containers in a way that cuts down on landfill additions and saves the city money.

While opposers of the ban argue that polystyrene materials can be recycled, Recology project manager Robert Reed told Mother Jones that few people bother to bring them in, and when they do, the material isn’t in good enough condition to be repurposed.

“The few buyers who exist demand that the material be very clean,” said Reed. “They don’t even want dust on it.”

The is the second such restriction the city has seen. In 2007, the city prohibited the use of polystyrene in all takeout food containers.

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