New, "green" biopolymer plastics need to be introduced with care if potential environmental benefits are to be maximised, says the Waste & Resources Action Programme (WRAP, Banbury / UK; www.wrap.org.uk). The warning follows a research study that shows consumers are confused by the wide range of new materials, with "biodegradable", "home compostable", "compostable" and "degradable" all being introduced in bag, pot, tray, film and bottle formats.

Initially, consumers rated biodegradable and compostable plastics very favourably as they believe they break down after disposal. However, when made aware of the possible impacts some of the biopolymers can have on plastics recycling, commercial composting or landfill disposal, respondents were less clear of the overall benefits and left feeling confused.

“There is a lot of confusion about compostable packaging and biopolymers,” says WRAP executive director Phillip Ward. “Some of these new materials do have great potential, but it is vital that they are introduced carefully, with the correct infrastructure in place.”

WRAP believes that material producers and retailers have a responsibility for introducing the new materials in a responsible and coordinated manner. It says clear labelling and guidelines are vital, along with a better understanding of the full environmental benefits. WRAP is planning to work with key groups in the sector to review the options and impacts of collecting biopolymers through plastic recyclables and food waste collection routes.