Wūrǎn huánjìng shì hòuhuàn-wúqióng de shì, bìxū lìkè zhìlǐ.
Polluting the environment creates endless future trouble; it must be addressed immediately.
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From 《三国志·魏志·武帝纪》: 夫刘备，人杰也。今不击，必有后患 - Cao Cao's warning that sparing Liu Bei would invite disaster later. Still used to argue that a small problem ignored will grow.
