The graph below shows average carbon dioxide emissions per persion in the United Kingdom, Sweden, Italy and Portugal between 1967 and 2007.

The line chart compares the carbon dioxide

emissions

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per head in four different countries throughout four decades, from 1967 to 2007. The countries include the United

Kingdom

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,

Sweden

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, Italy, and Portugal. In general, carbon dioxide

emissions

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in Italy and Portugal rocketed up

while

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the United

Kingdom

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and

Sweden

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decreased. On top of that, the United

Kingdom

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always had the highest metrics throughout the given time.

Similarly

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, Italy and Portugal had a small contribution to CO2

emissions

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in the first year. In 1967, Italy's emission value was 4

tonnes

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, but it went up roughly to about 8

tonnes

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ten years later.

However

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, it managed to slightly drop to around 7.5

tonnes

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in the

last

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period. Same case as Italy, Portugal was the lowest country in terms of CO2

emissions

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, starting with only more than 1.5

tonnes

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,

then

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gradually reaching its peak at nearly 4.5

tonnes

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, and

finally

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, it was stable at that value until the

last

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year.

On the contrary

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, the United

Kingdom

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and

Sweden

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managed to lower the number of

emissions

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. The United

Kingdom

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showed a steady fall from the highest with approximately 11

tonnes

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to only 9

tonnes

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in 2007. Despite a little bounce from 8 to over 10

tonnes

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in the first decade,

Sweden

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was able to decline the trend as well, to being the least emission country

at the end

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of the period with around 5

tonnes

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.