Getting rid of glass would be good.
Making more aluminium cans would be great, lower weight = cheaper transport and chilling costs.
They both cost the same to make.
I like the idea thats used in places in America, glass beer bottles are only sold at 'room temp', meaning that only Ali beer cans are sold chilled
( but the 'open container' laws suck. Getting drunk in a car with a sober driver is one of lifes great experiences. Though NZ does have ' no alcohol zones' in individual towns )