必修三模塊四 Sandstorms in Asia學(xué)案
s4: no smoking
s5: leftover food here
t: now complete the poster with a few sentences using pictures if necessary.
(ask several students to show their posters)
show sample poster:
save our earth
plant trees every year.
keep off the grass.
ride a bike or walk to work or school.
no smoking.
don’t throw away rubbish.
step 3 writing
ask students to read the message on an internet environment discussion group and find out the detailed information. then write a message to the internet environment discussion group to show your opinions about an environmental problem.
t: now read the message and answer the three questions on top of page90, activity17.
(after read the passage)
t: have you found the answers? now we’ll check the answers. now we’ll come to activity18.
first you should choose a topic and then follow the instructions to write a message.
step 4 suggested message:
i’m very concerned about global climate change. it’s a very serious global problem today.
from what i understand, there are many factors for global warming. the doubling atmospheric carbon dioxide, a greenhouse gas, would cause rising ocean temperatures, which will cause an increase in evaporation. the added water vapor, also a greenhouse gas, will enhance the greenhouse effect, which would further increase global warming.
there is evidence that for nearly two hundred years our planet has been warming. this is seen not only in climate observations, but also in some physical and biological indicators of environmental change. some scientists, supported by concerned environmental organizations such as greenpeace and the world wild life fund, have concluded that many of the patterns associated with this warming can be attributed to the growing impact of human activity on the planet.
they have forecast that over the next hundred years we will create a climate on earth that will be warmer than any so far experienced by the human species. they believe that this rate of change may be unprecedented in the history of our planet and will be so great that many of our ecosystems and wildlife species will fail to adapt.
in recent years, more and more people are paying attention to this problem. but few of them take the measures. we need to stop people from doing it. we should do all that we can to reduce such pollution.