Global warming Unit 4. What causes the global warming? Human activity or a random but natural...
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Transcript of Global warming Unit 4. What causes the global warming? Human activity or a random but natural...
Global warming
Unit 4
What causes the global warming?
Human activity or a random but
natural phenomenon?
Think about:
When we talk about this problem, we
naturally link it to the use of energy
and the environmental pollution.
But firstly and importantly, energy
makes a great difference to our lives.
What things do we use energy for?
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.
windmills a coal power station
an oil refinery a nuclear power plant
solar panels a hydro-electric dam
Fossil fuel ( 化石燃料 ) : Ancient animal and plant material below the surface of the earth with a high carbon content, such as coal, oil and natural gas, which can be burnt to produce energy; also known as non-renewable energy because once they are used they have gone forever; they cannot be renewed.
What are fossil fuels?
Sample listsThings that use energy
Sources of energy
Renewable / non-renewablelight
heatingtelevision
cassetteplayervideo
recorder
oilcoal
natural gas
wind (wind power)
sun (solar energy)
renewable
renewable
non-renewable
non-renewable
non-renewable
fridge
stove
washing machine
hair-dryer
water( hydro-electric) renewable
plant waste (biomass energy)
renewable
hot springs or geysers (geothermal energy)
renewable
the sea (tidal energy)
renewable
computer uranium (nuclear energy)
non-renewable
Renewable or non-renewable?√
Renewable or non-renewable?√
Carbon dioxide
coal
oil
natural gas
global warming● ● ● ● ● ● Why?
Fossil Fuel
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 traps the heat from the sun and
keeps it from escaping. This makes
the greenhouse heat up and so the
plants can grow
throughout the
cold period.
How does a greenhouse work?
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”.
Greenhouse effect
The greenhouse effect is a naturally occurring process that aids in heating the Earth's surface and atmosphere. It results from the fact that certain atmospheric gases, such as carbon dioxide, water vapor, and methane, are able to change the energy balance of the planet by absorbing longwave radiation emitted from the Earth's surface. Without the greenhouse effect life on this planet would probably not exist.
“ 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!