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《Unit One Housing Estates and Surroundings Lesson 3 Making Our Home Greener 》名校名师PPT课件（新世纪版七年级上册）
Human
Every day 75 kinds of animals, birds or plants disappear from our earth, that means 3 kinds disappear in one hour. Scientists say if we do nothing, 1／4 of the animals, birds or plants will die forever in the next 20 or 30 years.
How can we help?
We should wear cotton clothes.
We shouldn't wear fur or leather clothes.
We shouldn’t waste water.
We shouldn’t make our rivers dirty.
We should be good to wild animals.
We should tell people not to hurt them.
We should plant more trees around our homes.
List things we can do to help protect our home
One of the easiest ways is to—plant more trees.
What can trees do to us?
Ｏ２
wind
noise
weather /air
dust
shelter
greenhouse effect
water
wood
land and earth
fruits
sand and droughts