The provided line-graph depicted the change in average carbon emissions of 4 countries over a period of 40 years, from 1967 to 2007. The trend of average carbon dioxide emission per person is variable for every country. Some countries like the United Kingdom and Sweden had reduced their carbon footprint considerably whereas others like Italy and Portugal had done the exact opposite.
In 1967, the United Kingdom lead the tally with around 11 metric tonnes of carbon dioxide emissions. Sweden was second, with a share of around 8. 5-9 metric tonnes. An average Italian person only emitted 4. 1 metric tonnes whereas Portugese had the least carbon footprint with 1. 9 metric tonnes.
In 2007, however, the carbon dioxide emission by an average Britisher soared to 8. 5 metric tonnes. The graph for an average UK citizen shows a gradual down slope over the past 40 years. For Sweden on the other hand, a sharp upstroke was noticed from 1967 to 1977 of around 2 metric tonnes, which steeply reduced by 3 metric tonnes to around 6. 5 metric tonnes in 1987. In 20 years, from 1987 to 2007 however, there was a gradual fall in numbers and in 2007, only 6 metric tonnes on an average were contributed. Italy and Portugal both had a steep increase in their emissions from 1967 to 1997. Portugal had a steeper slope than Italy beginning from 1. 8 and inclining till 5. 8 metric tonnes. The rate however, plateaued from 1997 to 2007. Italy also had 4 metric tonnes share per person which progressed to 8 metric tonnes over a period of 30 years and stabilised from 1997 to 2007.
Overall, the emission by an average United Kingdom resident still surpasses other countries. However, it can be safely presumed that with declining numbers Britishers might not remain at the top. Sweden is one such example of significant change. However, Italy and Portugal need to implement stringent measures to reduce or stabilize their overall output. 
The provided line-graph depicted the  
change
 in  
average
  carbon
  emissions
 of 4  
countries
 over a period of 40 years, from 1967 to 2007. The trend of  
average
  carbon
 dioxide  
emission
 per person is variable for every  
country
.  
Some
  countries
 like the United Kingdom and Sweden had  
reduced
 their  
carbon
 footprint  
considerably
 whereas others like Italy and Portugal had done the exact opposite.
In 1967, the United Kingdom lead the tally with  
around
 11 metric tonnes of  
carbon
 dioxide  
emissions
. Sweden was second, with a share of  
around
 8. 5-9 metric tonnes. An  
average
 Italian person  
only
 emitted 4. 1 metric tonnes whereas  
Portugese
 had the least  
carbon
 footprint with 1. 9 metric tonnes.
In 2007,  
however
, the  
carbon
 dioxide  
emission
 by an  
average
 Britisher soared to 8. 5 metric tonnes. The graph for an  
average
 UK citizen  
shows
 a gradual down slope over the past 40 years. For Sweden  
on the other hand
, a sharp upstroke  
was noticed
 from 1967 to 1977 of  
around
 2 metric tonnes, which  
steeply
  reduced
 by 3 metric tonnes to  
around
 6. 5 metric tonnes in 1987. In 20 years, from 1987 to 2007  
however
, there was a gradual fall in numbers and in 2007,  
only
 6 metric tonnes on an  
average
  were contributed
. Italy and Portugal both had a steep increase in their  
emissions
 from 1967 to 1997. Portugal had a steeper slope than Italy beginning from 1. 8 and inclining till 5. 8 metric tonnes. The rate  
however
, plateaued from 1997 to 2007. Italy  
also
 had 4 metric tonnes share per person which progressed to 8 metric tonnes over a period of 30 years and  
stabilised
 from 1997 to 2007. 
Overall
, the  
emission
 by an  
average
 United Kingdom resident  
still
 surpasses other  
countries
.  
However
, it can be  
safely
 presumed that with declining numbers Britishers might not remain at the top. Sweden is one such example of significant  
change
.  
However
, Italy and Portugal need to implement stringent measures to  
reduce
 or  
stabilize
 their  
overall
 output.