Atwarwiththeplanet课件(精读6第三课).ppt

Gully Erosion (沟状侵蚀)
• a severe form of soil erosion,
• greatly accelerated by human activities such as urbanization, deforestation, overgrazing of cattle, etc. as they remove the remaining soil.
• Why is the image of the earth misleading?
• Can you name some other harmful effects that human exert on the environment?
Paras. 1-2
• exempt a. relieve, free 免除的 • breach v. to break a law, promise, agreement or
• Paras. 17-21: the issue should be understood in
terms of their interplay
• Paras. 22-23: how to solve the conflict between
the two worlds
Questions for Paras. 1-4
• Depletion of underground water caused by deforestation
Deforestation
• Widespread deforestation are caused by human activities, such as commercial logging, agriculture, mining, and oil exploration, etc.
• Ozone layer • Global warming • Solar radiation / energy • Ultraviolet light • Carcinogenic synthetic
pesticides • Microorganism • Photosynthesis • Fossil fuels • Organic compounds • bacteria and molds • algae • Carbon dioxide
的；难懂的
• residue n. something left after other parts have been taken away 残留物
• noxious a. harmful or dangerous 有毒的，有害的 • niche n. a small concavity 小凹陷处
relationship 违背， 违反 • unwitting a. unintentional 不知情的， 无意的 • portend v. to warn that sth. bad is likely to
happen in the future 预兆（坏事的发生） • exert v. put to use 运用 • fluctuate v. to move or sway 摇动
Phrases and expressions
• be free of / from without sth. • be exempt from not affected by sth. • on a planetary / large / small / global
scale 以......程度/规模 • tamper with to interfere with • become accustomed to be used to sth.
technosphere
• Conclusion: the two worlds are at war.
• grandiose a. impressive because of unnecessary largeness or grandeur; used to show disapproval; enormous 宏伟的；巨大的
Ozone Layer Hole
• Ozone is a gas that blocks harmful ultraviolet sunlight. Industrial chemicals released into the atmosphere have caused ozone to break down. Low levels of ozone are shown in blue.
some threatening factors
• Population growth • Global warming • Depletion of the Ozone Layer (ozone hole) • Habitat Destruction and Species Extinction
• Paras. 2-5: why are the two worlds at war?
• Paras. 6-14: the two worlds are governed by different laws
• Paras. 15-16: consequence of incompatibility between the two worlds
(deforestation, desertification, dust storm, mudslide, flood, drought, etc.) • Air Pollution (acid rain) • Water Pollution • Groundwater Contamination • Chemical Risks (use of chemical fertilizer) • Energy Production (nuclear energy)
• chemically burns the leaves of plants, poisons lake water, kills most of the aquatic inhabitants.
Forest Damaged by Acid Rain
Some terms in this lesson
___ the agreement they had made
with their employer
•
the ___ victims of a drugs dealer •
earthquakes were used to be
•
believed to ___ the end of the world•.
mundane• ___ tasks as eating or drinking •
overt • ___ criticism
•
esoteric • ___ religious teachings
•
• exposed to high levels of ___
radioactivity
mundane radioactivity breach overt unwitting esoteric portend
• radioactivity n. the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay 辐 射， 放射线
Exercises
breach•
unwittin•g portend •
• 臭氧层 • 全球变暖 • 太阳辐射 • 紫外线 • 致癌的合成杀虫剂 • 微生物 • 光合作用 • 化石燃料 • 有机合成物 • 细菌和真菌 • 藻类 • 二氧化碳
Outline of the text
• Para. 1: what are the two worlds?
•
theme: the two worlds are at war
•
money instigat•ing Both sides accuse each other of
• •
___ the fighting.
counter•attacTk he Republicans have launched a •
aquatic strong ___ against the Democrats. •
Lesson 3
At War with the Planet Barry Commoner
Warm-up questions
• What are some facБайду номын сангаасors threatening the environment?
• Have you done anything that is harmful to the environment in your daily life?
Earth Portrait taken from space
Paras. 3-4
• mundane a. ordinary 普通的
• fleecy a. (of fabrics) having soft nap produced by brushing 羊毛似的，起绒的
• overt a. open, obvious 明显的；公然的 • esoteric a. mysterious or beyond understanding 神秘
• ___ plants / system
para•site They tend to regard people on welfare as ___ s.
parasite counterattack instigating aquatic grandiose
Para. 5
• How do the two worlds interact with each other?
• A vicious cycle: • The technosphere alters the ecosphere • The altered ecosphere threatens the
•
Paras. 1-2
• What are “the two worlds” ?
• Some examples about the two worlds?
•
Paras. 3-4
• How was the responsibility divided? What is the present situation concerning this responsibility?
Sorcerer’s Apprentice 魔法师的门 徒
• In folklore, the sorcerer’s apprentice accidentally flooded sorcerer’s house because he learned to make a broom fetch
water but not how to make it stop.
Acid Rain
• caused by the combination of sulfur dioxide and nitrogen compounds
• rain with a very low ph. Normally, rainwater has a ph of 6.5, making it slightly acidic. However, with the addition of sulfur and nitrogen compounds, the ph of rainwater may drop to as low as 2.0 or 3.0, making it dangerously acidic.
• bountiful a. sufficient 足够的 • instigate v. to arouse 煽动，引起 • counterattack n. a returned attack against 反击
Exercises
grandio•se ___ plans / ideas for making