Notes:
a Feed the world: In 1994, Professor Pimentel of
* By 2100 the population will be 12-15 billion, or seven times its sustainable level.
* Farmers are abandoning 25 million acres each year because of soil loss or waterlogging.
* The declining fertility of the soil will lower food production by 20% in the next 25 years.
* Topsoil is being lost 40 times faster than it can be replaced.
* Crop losses destroyed by pests have increased four times in the last 50 years.
b It is thought that: Note the use of the passive for introducing an idea.
c For one thing: This phrase is linked to The problem is... in the previous sentence. = One reason why it is difficult to feed the world‘s population is that...
d suitable for growing crops: Point out the structure: suitable +for + -ing
e And this area is becoming smaller day by day.
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英语教案－Senior 3 unit4 lesson15