The humble milk carton has been part of our lives for so long that it is easy to forget that it was a marvel when it first appeared in 1952. Tetra Pak’s technology made a billionaire of Hans Rausing, scion of the company’s Swedish founding family, who died last week at the age of 93.

The Tetra Pak cartons, made from layers of paperboard and polyethylene, soon displaced glass bottles because they were far lighter and could easily be stacked and distributed. Its aseptic carton, with a layer of aluminium foil that allowed heat-treated milk to remain fresh, followed in 1961.

But every technology has drawbacks and Rausing died at the moment when those of plastic are becoming distressingly obvious. Landfills are stuffed with bottles and cartons, and trillions of pieces of plastic float in the world’s oceans. What happens to the 189bn Tetra Pak containers made last year as they are discarded?