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

The line graph illustrates the changes in the emissions of carbon dioxide per person in four European countries namely the United Kingdom, Sweden, Italy and Portugal over a 40-year period from 1967 to 2007. Units are measured metric tonnes. Overall, it can be seen that the amount of emitted carbon dioxide by each individual declined significantly in the United Kingdom and Sweden between 1967 and 2007, although the United Kingdom was the highest one who emitted much amount of carbon dioxide, while the figure for carbon dioxide in Italy and Portugal increased for the given period. The figure for the United Kingdom stood at 11 metric tonnes in 1967 and it underwent an downward trend, reaching at 9 metric tonnes in 2007. In addition, the CO2 emissions increased substantially at over 10 metric tonnes in Sweden in 1977, after that it halved throughout the period from 1977 to 2007. With regard to remaining countries, both Italy and Portugal had upward trends from 1967 to 2007 in spite of being at different amounts at the beginning of the given period. In 1967, the figures for Italy and Portugal stood at over 4 and about 1. 2 metric tonnes respectively. Eventually, Emissions rose significantly at under 8 in Italy while Portugal's was at above 5 metric tonnes in 2007.