I doubt that's made any kind of environmental/ecological impact at all. The cheap, flimsy plastic carrier bags contain orders of magnitude less material than the reusable kind, and had a second life as a bin liner. Now I need to buy bin liners, which are usually made out of sturdier plastic on top of having to get a reusable bag.

Most of the plastic involved in getting food from farm to home isn't the carrier bag or even the food wrappers. It's the massive amount of plastic that pallets of goods are wrapped in for shipping, which happens several times throughout the supply chain.

We should focus on the latter, instead of the former. Pretty much all we're doing is virtue signalling and maybe hoping that it'll make a tiny difference.

Heck, even a marginal improvement in fuel efficiency of trucks delivering to grocery stores would probably do more than these plastic bag shennanigans.

Where I live there are entire fields of crops grown under plastic sheeting, and I do not mean reusable plastic greenhouses, I mean sheeting pegged to the ground. And then the produce is boxed up in plastic, stuck on a palette, wrapped in plastic and delivered to the supermarkets.

Then, when I'm in town I see building projects where the entire building is wrapped in plastic sheeting: eight story buildings wrapped like a parcel in plastic. Even the ground-level hoarding that used to plywood boards is now typically covered in plastic sheeting printed with branding.

And the roadworks: what used to be reusable metal signs and barriers have recently switched to plastic signs and plastic barriers. I get these get battered and broken quickly but at least the steel ones would typically get melted down and reused at their end-of-life. I imagine the plastic ones just end up in landfill or incinerated.

It does kinda make my home recycling efforts seems futile when commercial enterprises are moving in the opposite direction towards more plastic.

There are significantly less palettes being delivered and handled by significantly less people, thus it is far easier to ensure that the plastic used in the delivery process is disposed of properly. Whereas with the abundance of cheap plastic bags that are available on tap to the masses, disposal turns into a mess. I generally agree with you that we should focus on the whole chain and there's lots of easy wins to be had, but decreasing the amount of plastic that gets stuck in trees or otherwise lost in the *environment* is still a good thing.

I'd like to address your last point because there's another thread about the larger amounts of plastic being easier to police:

Not all pollution is fungible.

Greenhouse gas emissions and the microplastic epidemic are two related, but separate issues.

There is no amount of fuel efficiency that would stop a plastic bag from blowing into a stream or tree and shedding microplastics as it breaks down.