The line graph illustrates the amounts of CO2 emitted by each person in four countries from 1967 to 2007. 
It is clear that
 each Swedish or Linking Words
UK
 person released less CO2 over the period researched, but CO2 emissions in Italy and Portugal showed a rise. Citizens in the Use synonyms
UK
 Use synonyms
was
 responsible for the largest amount of CO2 released all the time. 
In 1967, about 11 Correct subject-verb agreement
were
tonnes
 Use synonyms
CO2
 was produced by a Change preposition
of CO2
UK
 citizen, followed by 9 Use synonyms
tonnes
 in Sweden. In comparison, each Italian discharged over 4 Use synonyms
tonnes
 which Use synonyms
was
 approximately threefold higher than that of a Portuguese. 
From that time onwards, the average quantity of CO2 released in the Change the verb form
were
UK
 decreased gradually to under 9 Use synonyms
tonnes
 Use synonyms
while
 the figure for Sweden, after Linking Words
an
 Change the article
a
1 tonne
 climb in the first decade, Add a hyphen
1-tonne
also
 went down moderately to well under 6 Linking Words
tonnes
 Use synonyms
at the end
 of the period. Linking Words
In contrast
, more CO2 was produced by each person in Italy whose figure grew to nearly 8 Linking Words
tonnes
 in 2007, compared with an equally significant increase to roughly 6 Use synonyms
tonnes
 in Portugal.Use synonyms