1.forest fires 森林火灾 Forest fires can burn out of control and create hazy weather conditions. 森林大火会烧到无法控制的程度，并且造成烟雾重重的天气情况。 2.acid rain 酸雨 The acid rain ruined the soil for the next three generations. 酸雨会毁掉接下来的三代人的土壤 3.global warming全球变暖 Burning fossil fuels is a major cause of global warming. 燃烧化石燃料是全球变暖的一个重要原因。 fossil fuel 化石燃料（石油、煤） 4.climate change 气候变化 Climate change could have disastrous effects on Earth. 气候变化会对地球产生灾难性的影响。 5.greenhouse effect 温室效应 The destruction of forests is contributing to the greenhouse effect. 森林的破坏也会导致温室效应。 6.exhaust fumes 废气 Exhaust fumes from cars are poisoning the air of our cities. 车排放的废气正在毒害我们城市的空气。 7.ozone layer 臭氧层 Industrial additives have been threatening the ozone layer for many years.  工业添加剂已经威胁臭氧层很多年了。 8.pollute   pollution   pollutant 污染物质 Plastic bags in the ocean is a well documented water pollutant. 海洋中塑料袋是已经证实的水污染物。 9.waste 废物，废料 plastic waste 塑料废物 nuclear waste 核废料 radioactive waste 放射性废弃物 domestic waste (household waste) 家用废物 A government report said only 8 percent of domestic waste is being recycled. 一项政府报告显示只有6%的家用废物被回收利用了。 10.endangered species 濒于灭绝的物种 There are many endangered species all over the planet that need our help. 遍布全球有很多濒临灭绝的物种需要我们的帮助 11.habitat （动植物）的栖息地，生存环境 Lots of animals will become extinct if their natural habitats are destroyed. 许多动物将会灭绝，如果他们的自然栖息地被破坏了。