But according to The New York Times, that’s not entirely true, because unless people are going to carry their groceries home in their hands, the paper or cloth bags they use instead are actually worse for the environment, as counterintuitive as that may sound.
First, according to The New York Times, “it takes significantly more energy to create pulp and manufacture a paper bag than it does to make a single-use plastic bag from oil.” As a result, “you’d have to reuse a paper bag at least three times before its environmental impact equaled that of a high-density polyethylene plastic bag used only once. And if plastic bags were reused repeatedly, they looked even better.”
So, “unless you’re reusing your paper bags a lot, they look like a poorer option from a global warming standpoint.”
Reusable bags made out of cotton aren’t much better. In addition to the “energy, land, fertilizer and pesticides” needed to grow the cotton, “an avid shopper would have to reuse his or her cotton bag 131 times before it had a smaller global warming impact than a lightweight plastic bag used only once,” the Times reported, citing a 2011 study by Britain’s Environment Agency.
In fact, “what’s in the bag most likely matters more than the bag itself … A pound of beef bought at the supermarket will have roughly 25 times the global warming impact as the disposable plastic bag it’s carried in.”
As a growing number of cities and states consider implementing bans on plastic bags, policymakers should consider the unintended consequences of their actions for the benefit of their constituents and the environment.