人教新课标选修六UNIT4GlobalWarming全单元课件

The Hydroelectric dams
are used to keep back water and raise its level for irrigation or for producing electricity, etc.
Discussion
An energy source is “renewable” when supplies of it never run out and “non-renewable” when one day they will run out. Which energy sources on your list are renewable and which are non-renewable?
人教新课标选修六
Unit 4
Global Warming
贵州省思南中学 许义怀 制作
The effects of global warming
• Negative effects:
1 cause the sea level to rise; 2 severe storms; 3 droughts; 4 famine; 5 destruction of species 6 flood
Windmills
Wind energy is used as power to produce electricity .
The coal power stations
where electricity is produced by burning coals.
in which oil is refined and made pure.
Non-renewable
Coal Oil Natural gas Uranium[化]铀 (nuclear energy)
Fossil fuels
Renewable
Wind (wind power) Sun (solar energy) Water (hydro-electric power) Plant waste 植物性废物 (biomass energy 生物团能量 ) Hot springs or geysers 间歇泉 (geothermal energy) The sea (tidal energy 潮汐能 )
energy sources
cassette player
micro-wave oven
heating
fridge
things that
light hairdryer
use in
eysnoteourrvgey
home
television computer
stove
video player
washing machine
The glass traps the heat from the sun, making the air warm so that plants can grow better.
Greenhouse gases!
What’s greenhouse gases effect?
Greenhouse gases perform the same function as the glass in heat of the sun and keep the air surrounding the earth warm. It is called the greenhouse effect.
The Oil Refineries
A nuclear power plant
a facility designed to convert nuclear energy into electricity.
Solar panels
on the roof of a house on a bright sunny day are used to collect solar energy, making your house warm or heating your water.
What are fossil fuels?
• Fossil fuels are 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. They are also known as non-renewable energy because once they are run out of /run out, they cannot be renewed.
•Money? •Technology? •Man power?
•Energy sources?
•International relations? •…
We depend on energy to do many things in our daily lives. For example, energy lights our cities and heats our buildings. Make a list of things that use energy in your home, in your school, or any other places you can think of.
What are these buildings made of and what is their purpose?
They are made of glass and plants can grow in it when it is cold outside.
How does it work?
The effects of global warming
• Positive effects:
1 make plants grow faster; 2 crops will produce more; 3 make life better
Which is the most important to a country?