Aha! While tidying a pile of books, I found a quote I had been wanting to share after discovering a snowstorm of degrading plastic bag in my desk drawer earlier in the month:
“Biodegradable plastic can be a well-intentioned nightmare, clogging up recycling processes with potential to ruin a whole batch. In landfill it rots, emitting methane.” (Berners-Lee M. How Bad are Bananas? Profile Books, London, 2010 (p180)
Which reminds me: I should get round to a hunt round the various plastic bags I have stored away as wrappers for things or in case I need them and see if any of them are showing signs of crumbling.