温室效应 (wēnshì xiàoyìng): This term refers to the greenhouse effect, where certain gases in the atmosphere trap heat and contribute to global warming.
大气污染 (dàqì wūrǎn): This term means air pollution, which occurs when harmful substances are released into the atmosphere, causing negative effects on human health and the environment.
臭氧层 (chòuqìceng): This term refers to the ozone layer, a protective layer in the Earth's stratosphere that absorbs most of the sun's ultraviolet radiation.