The provided line graph illustrates how much carbon dioxide (CO2) was emitted per person in the United Kingdom, Sweden, Italy, and Portugal over 40 years period from 1967 to 2007. Units are measured in metric tonnes. 
Overall
, it can be clearly seen that Linking Words
while
 the Linking Words
two
 countries with the highest level of Use synonyms
emissions
 at the start decreased moderately, the Use synonyms
two
 countries with the lowest amount of production increased significantly. Use synonyms
As a result
, Linking Words
although
 the United Kingdom remained the most producer of CO2 throughout the given period, the gap between the highest and lowest was smaller Linking Words
at the end
.
In terms of the Linking Words
two
 nations with high levels of Use synonyms
emissions
 in 1967, the UK was the first rank which accounted for 11 in 1967,Use synonyms
Linking Words
however
 the figure experienced a steady fall over 40 years to the end at under 10. Add a comma
,however
Likewise
, Sweden started at over 8, and even though reached its peak at 10 in 1977, it Linking Words
then
 fell significantly to the end at approximately under 6.
Regarding the Linking Words
two
 countries with the low levels at the start, in 1967, the figures for both Italy and Portugal were far lower than the UK starting at above 4 and below 2, respectively. In the following 30 Use synonyms
years
 the production of Add a comma
,years
emissions
 in Italy grew dramatically to almost 8, Use synonyms
thus
 exceeding that of Sweden. Linking Words
Similarly
, the figure for Portugal climbed noticeably by roughly 4. After that, the amount of Linking Words
emissions
 for both Italy and Portugal experienced a steady remain until 2007.Use synonyms