Every industry can be part of the solution — or part of the ongoing problem.

Over the past few years, reusable plastic shopping bags began showing up in grocery stores in many parts of the world. They are sturdier than the flimsy plastic bags that have become a symbol of the global movement against disposable plastics, and so can be used many times, lending to their marketing as the ethical choice for the environmentally conscious shopper.

But of course, these thicker bags require more plastic to make. That means they could only improve the overall situation if they led to stores handing out overall less plastic, by volume, than they would without them—by, say, replacing thousands of single-use plastic bags a shopper might otherwise use over the years. Because no matter the style of plastic bag, it will still contribute to the global problem of forever-trash entering the environment, and the greenhouse gases associated with manufacturing the bag from fossil fuels in the first place.

But it seems they haven’t. A new report from the Environmental Investigation Agency (EIA) and Greenpeace looking at grocery stores in the UK suggests that the plastic “bags for life” utterly failed to do the one thing they were ostensibly meant to. So far in 2019, the top 10 UK grocery stores reported selling 1.5 billion of these bags, which represents approximately 54 “bags for life” per household in the UK.

For comparison, the top eight UK grocery retailers—representing over 75% of the market—sold 959 million such bags in 2018.

Some supermarket chains have seen particularly big spikes in sales. The frozen-food store Iceland sold 10 times more plastic “bags for life” this year, 34 million, than last.

REUTERS/Chris Wattie Plastic-bag overload.

The UK introduced a 5-pence charge for plastic bags in 2015, and the government urged shoppers to instead bring their own reusable “bags for life,” which led to a surge in purchasing of the reusable plastic bags from markets.

“Our survey reveals a huge rise in the sale of plastic ‘bags for life,’ demonstrating the inadequacy of the current policy which is clearly not providing a strong enough incentive for people to stop using ‘bags for life’ as a single-use option,” the report reads.

Overall, those same supermarkets increased the volume of plastic packaging they put out—including the “bags for life”—by 18,739 tons (17,000 metric tons) from 2017 to 2018. “It’s shocking to see that despite unprecedented awareness of the pollution crisis, the amount of single-use plastic used by the UK’s biggest supermarkets has actually increased,” the EIA’s Juliet Phillips told the Guardian. The grocery stores’ plastic-footprint increase was caused in part by the reusable plastic bags.

“We have replaced one problem with another,” Fiona Nicholls, a Greenpeace UK campaigner who is one of the report’s authors, told the New York Times. “Bags for life have become bags for a week.” The bags, the report says, should be banned. Instead, customers could bring their own bags to the market. “When we go shopping, we should remember our bags like we remember our phones.”