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Rising sea levels
and the increase 
in 
greenhouse gases
1
are the result of our actions. We are 
disturbing the 
ecological balance
everywhere, as can be seen in the decrease in 
fish stocks
2
in 
the oceans. 
1
gases which cause the greenhouse effect, especially carbon dioxide 
2 
the number of fish 
It is dear that we must 
tackle pollution 
before it is too late. 
Exhaust fumes
from 
millions of vehicles and the burning of 
fossil fuels
3
 
are causing 
irreparable
4
 
damage 
to our environment. 
3
fuels such as gas, coal and oil 
4
which cannot be repaired (also 
irreversible
) 

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We must accept that we have 
seriously depleted
5
 the ozone layer 
in the last few 
decades by our selfish actions. Embracing 
green politics
may be our best hope in 
the long term, but we need urgent short-term measures too. 
5 
reduced something in size or amount, especially supplies of energy, money 
,etc. 
Crops fail
year after year in some of the poorest parts of the world. This has 
brought 
devastating
6 
floods 
to others. We call these 
natural disasters,
but it is 
human beings who are causing them.
6 
causing a lot of damage or destruction 
2.
Use a collocation dictionary
. If you don’t have a collocation dictionary, a 
learner’s dictionary will give you several example phrases for each word, as well 
as telling you which propositions and so on the word is used with.