Why have you started bringing your own shopping bag lately? Didn't you always use plastic bags before?
B: 我以前没太在意，后来看了一些关于塑料污染的纪录片，觉得很震撼，就想改变一下习惯。Wǒ yǐqián méi tài zàiyì, hòulái kàn le yì xiē guānyú sùliào wūrǎn de jìlùpiàn, juéde hěn zhènhàn, jiù xiǎng gǎibiàn yí xià xíguàn.
I didn't pay much attention before, but then I watched some documentaries about plastic pollution, found them shocking, and wanted to change my habits.
A: 确实，塑料垃圾对海洋生物的伤害太严重了。Quèshí, sùliào lājī duì hǎiyáng shēngwù de shānghài tài yánzhòng le.
Indeed, the harm plastic waste does to marine life is far too serious.