The line graph provides key information about aggregate carbon dioxide in four nations, over a period of 40 years. the units are measured 
by
 Change preposition
in
tonnes
. 
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Overall
, it is clear from the graph that (Portugal) was the lowest one in 1967, Linking Words
whereas
 the United Linking Words
Kingdom
 was the highest line. Use synonyms
In addition
, Italy and  Sweden are in the middle between the United Linking Words
Kingdom
 and Portugal. 
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According to
 what is shown, the United Linking Words
Kingdom
 Use synonyms
was decrease
 over the years between nearly 11 Wrong verb form
decreased
tonnes
 to 8.5 Use synonyms
percent
. on the opposite, Portugal Change the spelling
per cent
was 
rose dramatically to a peak of mostly 4.5 Unnecessary verb
apply
tonnes
 in 2007. Use synonyms
Linking Words
Although
, the United Correct word choice
However
Kingdom
 overtook all the nations in 2007. 
In terms of, Italy slightly grew on the same pattern and went from Use synonyms
tonnes
 to 7 Use synonyms
tonnes
. Use synonyms
However
, Sweden dropped over the years and in the end met with Portugal at relatively 4 Linking Words
tonnes
.Use synonyms