联合国环境规划署(UNEP)近日发布的报告指,以生物降解塑胶及生物塑胶代替传统的一次性胶袋,对减轻全球暖化及环境负荷的效果有限,最好的方法是重复使用家中现有的胶袋。
UNEP通过分析海外7项研究结果,研究各种胶袋从生产到丢弃过程中对环境产生的影响。报告指,生物降解塑胶易在环境中分解,产生的垃圾问题较一次性塑胶小。但若考虑到燃烧塑胶带来的气候变暖、海洋氧化影响及塑胶所含化学物质导致的污染等,生物降解塑胶亦可能是最坏的选项。
报告又指,用植物淀粉及石油产品等生物材料制成的胶袋,堆填后会产生甲烷,对全球变暖亦带来严重影响,因此与含有聚乙烯的传统胶袋相比,在环保方面并无明显效果。报告指出,棉制和纸质袋不会产生微塑料污染,建议可多使用这两种袋。
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