砍伐森林 (Kǎnfá sēnlín)
deforestation
全球暖化 (Quánqiú nuǎn huà)
Global warming
汽車冒煙 (Qìchē mào yān)
smoke from cars
颱風 (Táifēng)
typhoon
土石流 (Tǔshíliú)
landslide
乾旱 (Qiánhàn)
drought
自然災害 (Zìrán zāihài)
natural disasters
工廠冒出的煙霧 (Gōngchǎng mào chū de yānwù)
smoke from factories
溫室效應 (Wēnshì xiàoyìng)
Greenhouse effect
洪水 (Hóngshuǐ)
flood