The graph below shows average carbon dioxide (CO²) emissions per person in the United Kingdom , Sweden, Italy, and Portugal between 1967 and 2007

The line graph compares the data on average carbon dioxide emissions per person in four countries: the UK,

Sweden

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, Italy, and Portugal - over the next four decades, starting in 1967.

Overall

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, more and more carbon dioxide emissions were produced in Italy and Portugal,

while

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the reverse was true for countries like the United Kingdom and

Sweden

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.

Moreover

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, the dominant country in terms of air pollution was

Sweden

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throughout the whole period. In 1967, the average CO2 discharges for

UK

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the UK

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and

Sweden

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were around 11 and 8 metric

tones

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tonnes

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respectively,

however

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, Italy and Portugal had significantly lower figures at nearly 4 and 1 metric

tones

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tons

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respectively. By 1977,

Sweden

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had reached the peak point of the span at approximately 10 metric tons.

On the other hand

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, until 1997, Italy and Portugal had been increasing gradually to about 8 and 5 respectively,

whereas

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the UK and

Sweden

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had been decreasing steadily to 10 and 6 respectively.

Furthermore

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, Italy and Portugal remained unchanged over the

last

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decade of the span.