高中英语北师大版 选修八 Unit 22 Environmental Protection Lesson 1 课件（32张）

课件32张PPT。Unit 22 Environmental Protection
Lesson 1 What’s wrong?The earth is sweating !!!
----Global warmingAcid rain
Greenhouse effect Lead-inPre-readingPredict : (group work)
What is the text about?
Based on the title “Can we take the heat”and the following pictures.
Traffic Jam FactoryThe text may be about:1.Vehicles and factories pump varieties of gases in huge quantities, especially carbon dioxide, into the atmosphere, which causes the greenhouse effect and will cause some other disasters.
2. How do we take actions to wrestle with this problem and stop the disasters from happening?What is global warming?Global warming means an average increase in the Earth’s temperature which leads to climate change.SkimmingRead the text and match the heads with
the paragraphs.
1.Draw readers’ attention to the topic by asking questions.
2.What should human beings do.
3.What is global warming.
4.Consequences of global
warming.
5. What cause global warmingPara 1.
Para 2.
Para 3.
Para 4.
Para 5.Word studyScan the text for these following words and work out their meanings.
consensus, bounce, agriculture, coincidence, condemn, reservation, sacrifice, advocateScanning
1. In the last few decades, scientists have reached consensus and reported that human beings are causing changes in the earth’s climate
2. Without these naturally occuring gases, the sun’s rays would bounce back into space leaving the Earth cold and impossilbe to live on.agreementjump back3. Given this data, it seems that the link between human activities and rising global temperatures is not merely a coincidence.
4. if we continue to produce carbon dioxide and other gases in such huge quantities, we are condemning life on Earth巧合destroying5. Some government, for example, the USA’s federal government, express reservations about whether global warming is really caused by human activities.
6.Experts advocated that each person play their part to save the earth.保留意见put forward and supportMatch the Key Words with their Chinese meanings. consensus
bounce
agriculture
coincidence
condemn
reservation
sacrifice
advocate反弹
农业
巧合
一致的意见
保留
宣判死刑
主张，提倡
牺牲Careful reading(1)
changes in the Earth’s climateglobal warmingenvironmental problemsan average increaselead to
be pinned on human activitiesin such huge quantitiesdisastersreduce the amount of carbon dioxideplay their partRead the text and answer the following questions.
1. What is controlling the temperature of the Earth?
2. Are greenhouse gases necessary for life on Earth?
3. What human activities are causing global warming?
4. By how much has the global average temperature increased in the last 100 years?
5. How can we help solve the problem of global warming?Careful reading(2)Fill in the blanks about the text.Global warming means an average increase in the Earth’s temperature which causes climate change in turn. Scientists think it is ______ ______ that cause global warming, especially gases from ________ and vehicles which speed up global warming.factorieshuman beingsThey also think global warming is one of the biggest environmental problems in the 21st century.
The Earth’s temperature is controlled by __________ _____like carbon dioxide which ___ heat from the sun in the Earth’s atmosphere. Many experts believe global warming is mainly causedgreenhouse gases trapby human ________. Over the last 100 years , the global average temperature has increased _______ and if human beings continue to pump __________ gases into the Earth’s atmosphere, the global warming will cause dramatic climate changes like more frequent floods, _________ and by 1°F greenhouseheat waves activitiesDroughts. There are some serious diseases. Sea level will be ______ , floating coastal area , negatively affecting ______ and forestry.
So governments all over the world should reduce the ______of greenhouse gases. We individuals should pay ________ to what we are doing, even raisedfishingreleaseattentionsmall changes like ______ public transport, ________, using low-flow ____________, buying energy-efficient ___________ using recycled paper or ___________ lights can have __________ on the future of the Earth .taking recyclingshower heads light bulbsswitching off great effect Post readingVoice your opinions: Taking action on global warming (or climate change) is similar. In some cases, it only takes a little change in lifestyle and behavior to make some big changes in greenhouse gases reductions. For other types of actions, the changes are more significant. When that action is multiplied by the 1.3 billion people in China. Or the 6 billion people worldwide, the savings are significant.What difference can we make?Group work take public transport like busesExamples The recycling symbol buy the recycled productsRecycled productsuse low-flow shower headsbuy energy-efficient
light bulbsreplacewithLanguage pointsHere are some key phrases from the
text:beyond our control
pump into
speed up
refer to
trap…into…
bounce back
as a result of
lead to
be relevant to
in such huge quantities
have a responsibility to
in turn
as individuals
switch off
take action out of our controlpipe intoacceleratemeansput in the trapsend backbecause ofcausebe related towithin large amountbe responsible forone after the otherindividuallyturn offtake measuresvocabularyUse the expressions in the box in the correct form to complete the sentences.
beyond our control, pump into, as a result of, in large quantities, refer to, speed up
1 Water was the fish pond
from the river.
2 We all need to to finish in time!
pumped intospeed up3 There is nothing more we can do .the situation
is now .
4 the accident, she is
now afraid of water.
5 The scientist global
warming at least three times in his speech.
6 The factory was producing greenhouse gases _________________ .beyond our controlAs a result ofreferred toin large quantitiesHomework Ex1, 3 on P54