Will compostable plastics biodegrade as advertised in the open environment?

Compostable plastics are degradable under industrial composting conditions, which offer controlled temperature, oxygen and humidity conditions – notably, these are not attainable under home composting conditions. Claims of 90% biodegradation within 6 months only pertain to industrial composting conditions, and compostable plastics will not biodegrade to the same extent if they end up in the open environment, or if composted at home.