A biodegradable material produced from a sustainable farming system, corks are to be encouraged.

It also said retailers could the charge by switching to paper bags and those made from biodegradable material.

Inside these heated vats, known as anaerobic digesters, bacteria break down the biodegradable material and create gas.

Flowerpots are now often also made from plastic, wood, stone, or sometimes biodegradable material.

Plastic provides a more durable ship than biodegradable material for carrying the organisms over long distances.