北师大版（2019）选择性必修第一册 Unit 3 Conservation Lesson 1 The Sixth Extinction 课件（12张PPT）

(共12张PPT)
Unit 3 Lesson 1
The Sixth Extinction
Objectives
By the end of the class, we will be able to:
find the causes, effects and solutions of the sixth extinction.
2. deliver a speech on the sixth extinction by the aid of the
graphic organizer.
3. discuss actions we teenagers could take to help avoid
the sixth extinction.
Extinction: when a particular type of animal or plant stops existing.(Longman Dictionary 5th Edition)
Five times of extinction Reasons
1st : 439 million years ago, 86% of life on Earth was wiped out
2nd: 364 million years ago, 75% of species were lost 3rd : 251 million years ago, 96% of species were lost 4th : 199 -214 million years ago, many species were lost 5th: 65 million years ago, ended 76% of life on earth, the extinction of dinosaurs Activate and share
Read the first paragraph and underline the reasons for the five times of extinction.
Read the text about extinction and find the main idea for each paragraph.
Read and Explore
a causes/reasons
b what might happen
c what we can do
d background history
Para.1
Para.2
Para.3
Para.4
Will Humans Survive the Sixth Great Extinction
Suppose you are a member of Green Club in your school. Prepare a speech entitled “Will Humans Survive the Sixth Great Extinction ” Try to explain the sixth mass extinction, analyze its causes and effects, and offer solutions in your speech.
Express yourself
Read the text and use the graphic organizer to show the detailed information about the sixth extinction.
Read and Explore
As a teenager, what could we do to avoid the sixth extinction
Do not leave the tap running while you brush your teeth.
Turn off the light when you go out.
Do the garbage classification
Take public transport.
……
Discussion
Will Humans Survive the Sixth Great Extinction
Suppose you are a member of Green Club in your school. Prepare a speech entitled “Will Humans Survive the Sixth Great Extinction ” Try to explain the sixth mass extinction, analyze its causes and effects, and offer solutions in your speech.
Express yourself
The earth has gone through 5 times of extinction, which are caused by natural activity such as volcanic eruption, asteroids and so on. However, human activity is now to blame for the sixth extinction.
The beginning of the speech is already given:
When you save water,
it saves you back.
When you refuse to reuse,
it’s the Earth you abuse.
Save the Earth.
We have nowhere else to go.