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某地自然环境极适合长绒棉生长,于是大面积种植。因气温低,需覆膜育秧,于是大量使用农膜。覆膜操作可用机器,但回收不易,于是大量废膜留在地里。科技进步,发明了可降解塑料薄膜。棉农大喜而用。但这个降解是假降解,即高分子材料的分子结构并没有发生变化,仅物理状态在助剂作用下改变,材料被崩解。于是片状的农膜变成了细细的微粒。年年累积,土壤中塑料微粒越积越多,随风飘散,随雨入江河入大海。于是,这些微粒被发现在人们推崇的海洋鱼类中。当然,塑料微粒不仅仅来源于棉田。吃火锅,鱼肠等一定不要吃。
-20010320(老刘); 2021-3-29 {485} (#13599916@0) +1