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,

the

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Sweden and the United Kingdom experienced a decline

of

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emissions in these forty years,

while

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

tonnes

of carbon dioxide, and

then

the figure fell

down

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to 8.5 in 2007. Starting from 8.5 metric

tonnes

in 1967, the emission amount of

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Sweden peaked in 1977

with

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approximately 10 metric

tonnes

per person before descending

down

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

the

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Italy and

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Portugal shared a similar development amount, as about 4 metric

tonnes

per individual. Each Italian generated about 4 metric

tonnes

in 1967 and

then

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.