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

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per

head

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in the United Kingdom (UK),

Sweden

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, Italy and Portugal from 1967 to 2007.

Overall

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, the carbon dioxide

emission

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of Italy and Portugal showed a similar and significant

increase

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over the period,

while

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CO2

emissions

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

at the end

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of the time period.

However

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,

Sweden

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showed a sharp

increase

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in the first decade and

then

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experienced a downward trend. In 1967, CO2

emissions

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

tonnes

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respectively.

Then

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, Italy's CO2

emission

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alternately

increase

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

tonnes

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per

head

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. Portugal's CO2

emission

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

tonnes

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per

head

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. In early 1967, CO2

emissions

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in the UK were nearly 11 metric

tonnes

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per

head

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. In the meantime, declined the CO2

emission

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little by little and stayed at nearly 9 metric

tonnes

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

Sweden

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started from 8.4 and

increase

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gradually to 10.2 metric

tonnes

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

tonnes

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

Sweden

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in 2007.