Unit 1 Nature in the balance Welcome to the Unit 课件-2022-2023学年高中英语牛津译林版（2020）必修第三册

harm soil ecosystem overseas region continent million n. & vt.伤害，损害 n.土壤；国土，领土，土地 n.生态系统 adj.海外的，国外的 adv.在海外，向国外 n.地区，区域；行政区 n.大陆，陆地，洲 num.一百万；许多，大量 Words review length biodiversity species nut brazil nut lily water lily n.长，长度；时间的长短； 篇幅，（电影）片长 n.生物多样性 n. (pl. species) 种，物种 n.坚果 巴西坚果 n.百合（花） 睡莲 Words review variety wildlife beneath mass towering hardwood n.不同种类；变化，多样性； 变种，变体 n.野生动植物，野生生物 prep.在…下面，在…下方； 配不上 n.大量；团，块，堆；一大群 adj.大批的，广泛的 adj.高大的，高耸的；出色的 n.阔叶树；硬材（阔叶树的木材） Words review Welcome to the Unit P1 牛津必修Book 3 Unit 1 Nature in the Balance What will the Earth look like in 100 years? or will it look like this? Leading-in BUT It is a totally different thing in some other places !!! Look at the pictures and think about: What environmental problem does each picture refer to? Water pollution deforestation What environmental problem does each picture refer to? Water Pollution It results when contaminants(污染)are introduced into the natural environment. In turn, this can lead to public health problems for people living downstream(下游方向的). Water pollution is the leading主要的 worldwide全球范围的 cause of death and disease. Water pollution deforestation What environmental problem does each picture refer to? Deforestation采伐森林 Trees are cut down for use as building material or sold as fuel燃料. The removal of trees without sufficient reforestation has resulted in habitat damage, biodiversity loss, and aridity干旱. Water pollution deforestation What environmental problem does each picture refer to? Global Warming It is the unusually rapid increase in Earth's average surface temperature over the past century. The long-term effects of global warming include further ice melt, ocean warming, sea level rise, and ocean acidification酸化. Water pollution deforestation What environmental problem does each picture refer to? Air pollution It may cause diseases, allergies and even death to humans; It may also cause harm to other living organisms suc