The graph below shows the average carbon dioxide emissions per person in the United Kingdom, Sweden, Italy and Portugal.

The line graph illustrates average carbon dioxide (CO2)

emissions

per

head

in the United Kingdom (UK),

Sweden

, Italy and Portugal from 1967 to 2007.

Overall

, the carbon dioxide

emission

of Italy and Portugal showed a similar and significant

increase

over the period,

while

CO2

emissions

in the UK gradually decreased, but not decreased in the other three countries

at the end

of the time period.

However

,

Sweden

showed a sharp

increase

in the first decade and

then

experienced a downward trend. In 1967, CO2

emissions

in Italy and Portugal per person were almost 1.6 and 4.1 metric

tonnes

respectively.

Then

, Italy's CO2

emission

alternately

increase

until 1997 and was steady between 1997-2007 at 7.8 metric

tonnes

per

head

. Portugal's CO2

emission

increased gradually and end of the time period, it showed 5.7 metric

tonnes

per

head

. In early 1967, CO2

emissions

in the UK were nearly 11 metric

tonnes

per

head

. In the meantime, declined the CO2

emission

little by little and stayed at nearly 9 metric

tonnes

in 2007 which was the highest amount among the order three countries.

Sweden

started from 8.4 and

increase

gradually to 10.2 metric

tonnes

between 1967-1977. After that, dramatically reduced to 5.9 metric

tonnes

in 200 it was the highest value of Portugal and the lowest value of

Sweden

in 2007.