Unit 4

Global warming

Unit 4

Global warming

Look at the pictures and what do you know about global warming.

What causes the global warming?

Human activity or a random but

natural phenomenon?What things do we use energy for?

Think about:

Things that use energy around us or at any other places:

Where does all this energy come from?

From the following pictures, you will know where all this energy comes from.

wind power a coal power station

an oil refinery a nuclear power plant

solar panels a hydroelectric dam

Renewable or non-renewable?√

Renewable or non-renewable?√

A greenhouse

A greenhouse

is made of ______ and

is used for growing

_______, especially

during _____ weather.

What is a greenhouse made of and used for?

glass

plants

cold

The air inside is warm because the glass

_______ the heat from the sun and keeps

it from____________. This makes the

greenhouse heat ____ and so the plants

can grow throughout the

________ period.

How does a greenhouse work?

trapsescaping

cold

up

Now can you connect global warming

with greenhouse and think of the

relationship between them? Maybe

you can understand why we call

global warming “greenhouse effect”.

What will you do every day to help reduce greenhouse gases?

Taking public transport like busesTaking public transport like busescan reduce greenhouse gas emissions.can reduce greenhouse gas emissions.

And taking train can also help a And taking train can also help a reduction of greenhouse gas. reduction of greenhouse gas.

The recycling symbol

Buy the recycled products

Recycled products

Recycling the bottles

Paper recycling

Your paper could become part of a road or race-

track.

using low-flow shower heads

buying energy-efficient light bulbs

replace with

“ 低碳生活” (low-carbon life)

“ 低碳生活” (low-carbon life) ，就是指生活作息时所耗用的能量要尽力减少，从而减低碳，特别是二氧化碳的排放量，从而减少对大气的污染，减缓生态恶化，主要是从节电节气和回收三个环节来改变生活细节。

Save energy! Protect the earth!

Homework1. Look up the new words and expressions of the text in the dictio

nary.2. Preview Reading THE EARTH IS BECOMING WA

RMER — BUT DOES IT MATTER?