What sort of effects do those plastic bag bans have?

Vox, Aug 2019, excerpt

California’s ban, which also places a 10-cent tax on paper or reusable bags, is one of the most extensive in the nation, while all of Hawaii’s counties have passed laws that ban single-use bags, with some also tacking on a tax as high as 15 cents on other bags.

This has led to some backlash, including lawsuits from the plastics industries and efforts to roll back the laws. More than a dozen states, typically more conservative ones like Oklahomaor Mississippi, have passed laws that preempt local bag policies and put the question of taxes or bans solely in the hands of the state legislature.

Chicago banned thin plastic bags in 2015, but it allowed stores to use thicker plastic bags that could ostensibly be reused. “When that ban went into effect, the retailers’ response was that ‘Our customers want plastic, we can’t offer thin, let’s just start offering thick plastic bags,” said Tatiana Homonoff, an assistant professor of economics and public policy at New York University who has studied the plastic bag laws. The resilience of stores giving their customers some kind of plastic bag, she says, was “an unintended consequence of leaving close substitutes unregulated.” Chicago soon scrapped that policy and by February 2017 had implemented a new law: a 7-cent tax on all checkout bags.

“That’s where we see big changes in disposable bag use,” Homonoff said.

A study of the law by Homonoff and researchers at the University of Chicago and consulting firm ideas42 found that after the new policy went into effect, “Customers were much less likely to use a disposable bag, and switched to reusable bags or no bags at all.” Before the tax, about 80 percent of Chicago consumers used disposable bags and fewer than 10 percent used no bags at all. In the year after it went into effect, “the tax led to a large decrease in the proportion of consumers using a disposable bag, with roughly half of consumers switching to reusable bags while the rest opted for no bags at all.”

According to Homonoff’s research in both Chicago and Montgomery County, Maryland, “very small financial incentives can lead to big behavioral change,” she said. The fact that small fees, 5 or 7 cents, can lead to a big reduction in disposable bag use suggests that a sizable portion of the population is perfectly happy to use a reusable bag or not use a bag at all, and need just the smallest push to get there. Homonoff said that in her surveys, people would tell her, “I have a reusable bag in my car. Now I bring it into the store and actually use it.”

“As long as there is a fee component in place, that really drives people to not want to get that bag,” Romer said. “You see people walking out with something pressed under the arm.”

In Montgomery County, which implemented a 5-cent bag fee, the portion of customers observed by researchers at eight stores in the county who used disposable bags went from 82 percent to 40 percent, while the number of bags per trip also fell, according to Homonoff’s research. Beyond any environmental effects, these policies also seem to be changing the culture around single-use plastic, which many people know is environmentally damaging but still need a slight nudge to change their behavior. Alongside the bans, there’s been a surge of public awareness of the persistence of plastic waste and the folly of recycling it.

And these policies have real effects downstream — literally. San Jose, California, implemented its Bring Your Own Bag Ordinance in 2012, which included a ban on single-use plastic and a 10-cent fee for paper, and found dramatic decreases in “bag litter” in the city’s creeks and waterways. “The litter surveys demonstrated a reduction in bag litter of approximately 89 percent in the storm drain system,” a city environment and transportation committee report read, “60 percent in the creeks and rivers, and 59 percent in city streets and neighborhoods, when compared to data collected from 2010 and/or 2011 (pre-ordinance) to data from 2012 (post-ordinance).”

What drove the decrease in litter wasn’t just more people using more reusable bags — although that happened — but also a rise in using no bags. Reusable bag use jumped from about 4 percent of bags, the city said, to 62 percent, while the portion of people who used no bag doubled, and the average number of bags used per customer fell from three to fewer than one.

The Ferguson Foundation, a Washington, DC-area nonprofit group that organizes cleanup efforts in and around the Potomac River, found that after DC implemented a 5-cent fee in 2010 on single-use bags, the number of plastic bags removed by volunteers dropped by almost three-quarters.

But the preferred policy of the advocates and researchers isn’t being implemented everywhere. After the New York City Council approved a 5-cent fee for all takeout bags, the state legislature and Gov. Andrew Cuomo killed it before later passing a statewide law that banned plastic and allowed individual counties to impose a tax on paper.

“From what we’ve seen in other cities, it’s not going to be particularly effective,” Homonoff said of the New York law, as opposed to a tax on all takeaway bags. Romer, who worked on previous attempts to implement plastic laws in New York City, described the new law as “disappointing.” While New York City is following through by taxing paper, it is not required across the state, which means that outside the city, municipalities might allow for unlimited and untaxed paper bag usage, thus not encouraging overall bag usage to go down.

“We really want people to not get a bag at all if they’re getting an item or two, or bring their own bag,” Romer said. “I like visiting California to see that that works.”

Correction: An earlier version of this story misstated that an estimated 500 million to 1.5 trillion plastic bags are used each year worldwide. It should be 500 billion.

Matthew Zeitlin is a writer in New York.