We drink a lot of tea... so we use a lot of milk... and we've passed the 20th week of glass bottle milk deliveries.
That is at least 100 plastic bottles we would have used normally.
Glass is 100% recyclable and it can be recycled endlessly without loss in quality or purity.
The most obvious advantage to using glass milk bottles instead of plastic or carton containers is that they can be reused almost immediately. Those dairies that have embraced the scheme ask that clients 'rinse and return' bottles. The bottlers are returned to the dairy where they are sterilised in hot water, refilled, recapped and made ready for delivery again.
This process is much faster than having to throw old plastic or carton containers into your recycling and then waiting for it to be collected. Once your recycling has been taken away it has to be sorted and then shipped off to recycling plants which has an effect on the environment, if you consider how much fuel is used transporting the materials and how much energy is used recycling them.