How long does it take for the plastic/polythene shopping bags marked biodegradable to biodegrade?

  • $\begingroup$ Welcome to Earth Science Stack Exchange! I found one, two, three leads quite easily... Maybe you will have more specific questions after some research. $\endgroup$ – kwinkunks Sep 21 '15 at 14:58
  • $\begingroup$ Thanks @kwinkunks. But I have read these and other articles on the web and none gives a definitive answer (or any at all)! My own conclusion is that in nature biodegradable plastics/shopping-bags don't biodegrade at all! They only biodegrade in controlled, usually industrial, conditions. $\endgroup$ – Ali Khan Sep 21 '15 at 15:27
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    $\begingroup$ I'm voting to close this question as off-topic because it more suitable for sustainability.stackexchange.com. $\endgroup$ – BHF Sep 21 '15 at 20:31
  • $\begingroup$ @BHF I'm inclined to agree, but I can imagine more specific versions of this question that are about physical processes in/on the earth. If the OP cares to ask such a question... $\endgroup$ – kwinkunks Sep 21 '15 at 20:46
  • $\begingroup$ You will have to define biodegradable if you want answers based on facts, i.e. you can only expect a meaningful answer (also on sustainability.stackexchange.com) if you ask for a bag made of ..... $\endgroup$ – Jan Doggen Sep 22 '15 at 11:59