I'm sorry, but I don’t have access to specific articles or their content, including "Biodegradable plastic bags not so biodegradable" by Vicki Stein. However, if you're looking for sections that typically provide strong evidence for the need for new and improved biodegradable plastics, they would likely include:
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Environmental Impact: Sections discussing the current environmental problems caused by traditional plastics and inadequately biodegradable plastics.
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Scientific Research: Any data or findings from studies that demonstrate the limitations of existing biodegradable plastics, including their degradation rates and environmental conditions.
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Case Studies or Examples: Real-world examples highlighting the persistence of biodegradable plastics in certain environments (like oceans or landfills) and their failure to break down as expected.
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Regulatory or Industry Insight: Information about how current biodegradable options do not meet regulations or consumer expectations, and the potential for new innovations.
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Future Prospects: Sections that discuss the advancements needed in material science or alternative materials to improve the effectiveness of biodegradable plastics.
If you can provide specific excerpts or more details, I might be able to help you analyze them.