'Biodegradable' plastic bags survive three years in soil and sea: Plastic bags that claim to be biodegradable were still intact and able to carry shopping three years after being exposed to the natural environment, a new study has found.

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'Biodegradable' plastic bags survive three years in soil and sea: Plastic bags that claim to be biodegradable were still intact and able to carry shopping three years after being exposed to the natural environment, a new study has found.