科学素养与生活应用·英语30篇（2）

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可生物降解塑料与普通塑料有何不同

Biodegradable plastics break down into water, carbon dioxide, and organic matter under specific conditions.
They’re made from plant starches, cellulose, or polylactic acid (PLA), not petroleum-based polymers.
Industrial composting facilities provide the heat, moisture, and microbes needed for full decomposition.
In contrast, conventional plastics persist for centuries because microbes cannot recognize their molecular bonds.
Home compostable versions exist but require consistent warmth and humidity—not all backyard bins suffice.
Labels like 'compostable' don’t guarantee breakdown in oceans or landfills, where oxygen is limited.
Some bioplastics still release microplastics if degraded incompletely, raising ongoing research questions.
Manufacturers aim to balance durability during use with safe end-of-life behavior for circular economy goals.