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

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

Kingdom

,

Sweden

, Italy, and Portugal. In general, carbon dioxide

emissions

in Italy and Portugal rocketed up

while

the United

Kingdom

and

Sweden

decreased. On top of that, the United

Kingdom

always had the highest metrics throughout the given time.

Similarly

, Italy and Portugal had a small contribution to CO2

emissions

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

tonnes

, but it went up roughly to about 8

tonnes

ten years later.

However

, it managed to slightly drop to around 7.5

tonnes

in the

last

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

emissions

, starting with only more than 1.5

tonnes

,

then

gradually reaching its peak at nearly 4.5

tonnes

, and

finally

, it was stable at that value until the

last

year.

On the contrary

, the United

Kingdom

and

Sweden

managed to lower the number of

emissions

. The United

Kingdom

showed a steady fall from the highest with approximately 11

tonnes

to only 9

tonnes

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

tonnes

in the first decade,

Sweden

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

at the end

of the period with around 5

tonnes

.