Coca-Cola is to test a paper bottle as part of a longer-term bid to eliminate plastic from its packaging entirely. The prototype is made by a Danish company from an extra-strong paper shell that still contains a thin plastic liner. But the goal is to create a 100% recyclable, plastic-free bottle capable of preventing gas escaping from carbonated drinks. The barrier must also ensure no fibres flake off into the liquid. That would pose a risk of altering the taste of the drink - or potentially fall foul of health and safety checks. But industry giants are backing the plan. Coca-Cola, for example, has set a goal of producing zero waste by 2030. Coca-Cola was ranked the world's number one plastic polluter by charity group Break Free From Plastic last year, closely followed by other drink-producers Pepsi and Nestle.