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

The line graph compares

amount

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the amount

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of carbon dioxide released by

individual

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individuals

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in four European countries in a span of forty years. It is depicted that people in

United

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the United

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Kingdom contributed the most greenhouse gas emissions over the period shown. Nationally speaking,

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Sweden and the United Kingdom experienced a decline

of

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emissions in these forty years,

while

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the other two countries saw continuous increases. In 1967, one person in the United Kingdom released about 11 metric

tonnes

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of carbon dioxide, and

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the figure fell

down

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to 8.5 in 2007. Starting from 8.5 metric

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in 1967, the emission amount of

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Sweden peaked in 1977

with

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approximately 10 metric

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per person before descending

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to under 6 in 2007. Over forty years measured, surprisingly,

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Italy and

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Portugal shared a similar development amount, as about 4 metric

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per individual. Each Italian generated about 4 metric

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in 1967 and

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gradually rose to about 8 within four decades. Meanwhile, following the same developing path, the figure in Portugal reached about 5 from 1 during the same time frame.