Obviously we can't get a nationwide ban on a town-by-town basis, but if we can show the government that enough towns and enough people are keen to see a ban, I hope we can follow the example of the quarter of the world's countries that already have a fee or ban on plastic bags, and get a national policy in place.
But it's also really important that people are aware of the impacts of plastic – not just on wildlife, but on humans. There's no point getting a ban on plastic bags if people just go out and buy more plastic bin liners to replace the grocery bags they used to use. We need to understand the bigger picture, and realize the sheer craziness of using "disposable" bags made out of a relatively indestructible substance. Plastic bags being thrown away now could still be sitting in landfills in 500 years time. Globally we're adding another trillion bags every year. Future generations will surely look back at us, and wonder what we were thinking when we-literally-trashed the Earth.