人教版 (2019)选择性必修 第三册Unit 3 Environmental Protection评优课ppt课件

这是一份人教版 (2019)选择性必修 第三册Unit 3 Environmental Protection评优课ppt课件，共20页。PPT课件主要包含了drought，flood，Para1，Para4，Para3，Para2，Para5，Earth， led to， example等内容，欢迎下载使用。

1.T discuss the prblem f climate learn t identify the style f this text and infer the writer’s purpse. 3.T think abut hw we can d t deal with climate change.
Step 1. Lead-in
The temperature f the glbal surface rse abut 1.2 ℃ frm 1920 t 2016. The earth is becming warmer and warmer.
1.Lk at the graph belw.What infrmatin can yu get frm it?
melting ice
Sea-level rise
What can yu see in the pht? What might be the stry behind it?
Step 2.Fast-reading
1.What type f writing is this passage?A. Argumentative writing（议论文）B. Narrative writing（记叙文）C. Expsitry writing（说明文）D. Advertising writing（广告）
2.What’s the passage mainly abut?A.Sme plar bears died f the greenhuse effect the plar bears find warming has caused sme disasters and we must pay attentin t it.
C.Earth is getting warmer and warmer.
A.An alarming case abut a bear starved t death.
B.We need t d smething t reduce greenhuse gas emissins.
3.Read and match the main ideas with each paragraph.
D.Why is Earth getting warmer and warmer?
E.The rise in temperature has caused natural disasters.
1.Read paragraph 1, and fill in the blanks.
Step 3.Careful-reading
The ________ is getting warmer and warmer. Evidence ne: _______________________________Evidence tw: _______________________________Evidence three: ______________________________
a warming cean and atmsphere
rising sea levels
2.Paragraph 2 intrduces an example f the increase in temperature that had an impact n Earth’s eclgy. Read it and fill in the blanks.
Nrway’s Arctic island f Svalbard
A plar bear died f starvatin.
The bear cannt hunt fd because f lw sea-ice levels.
3.Read paragraph 3, and answer the questins.
1. Why is the “natural” greenhuse effect imprtant and necessary?The “natural” greenhuse effect is imprtant because it warms the Earth’s surface and keeps it habitable.
2. What are the cnsequences f high greenhuse gas emissins? High greenhuse gas emissins lead t mre heat energy being trapped in the atmsphere and rising temperatures.
4.Read Paragraph 3 again, and figure ut the reasn why earth’s temperature rising.
Keeping Earth’s warm and habitable
Greenhuse effect
“Natural” greenhuse effect
“man-made” greenhuse effect
Causing Earth’s surface temperature t rise quickly if t much heat energy is trapped
The rise in temperature
extreme rainstrms, heat waves
serius damage, csting human lives, ecnmic lsses
extreme weather/ natural disasters
5.Read Paragraph 4, and fill in the blanks.
6.Read paragraph 5, and answer the questins.
What can we d t fight glbal warming?*Gvernments: make plicies and take apprpriate actins and measures t reduce greenhuse gas emissins*Individuals: restrict the amunt f carbn dixide ur lifestyles prduce t reduce ur “carbn ftprint”
Step 4.Pst-reading
D yu think climate change is the result f human activity? Give yur reasns.Wh d yu think shuld take respnsibility fr dealing with climate change? What can we d?
In 2013,many peple 1. (shck) by a news pht f a dead plar bear which appeared t have starved and died.Experts claimed that lw sea-ice levels 2. (cause) by climate change meant the bear culd nt hunt seals as befre,s it had t travel greater distance 3. (find) fd.Then what is causing the increase in the glbal average surface temperature?scientists ften mentin a key climate prcess called the “greenhuse effect”,4. has tw cmmn meanings:the “natural” greenhuse
were shcked
effect and the “man-made” greenhuse effect.The “man-made” greenhuse effect has nw becme 5. big prblem.There is strng and cmprehensive evidence 6. the rise in temperature has led t an increase in extreme weather and natural disasters .In fact,news reprts are 7. (frequent) bradcast abut extreme rainstrms and heatwaves 8. (cause) deaths and ecnmic lsses.We as individuals can reduce ur “carbn ftprint” by 9. (restrict) the amunt f carbn dixide ur lifestyles prduce.It is ur respnsibility 10. (seize) every pprtunity t educate everyne abut glbal warming.
restricting