Denmark used to have a system for reusing glass beer bottles. There was one standardized size that all the breweries used, and they were reused. At some point

Denmark used to have a system for reusing glass beer bottles. There was one standardized size that all the breweries used, and they were reused. At some point in the last decade or so, the system was changed so now the glass gets recycled instead. The bottles are thinner now (lighter to transport, less material used) and allegedly it works out to less impact, based on some model. (Though I've also heard it was mainly because breweries wanted to be free to decide the look of their bottles, for branding reasons, and something about EU harmonization to make it possible to sell imported beers.)