The line graph depicts the amount of carbon dioxide emissions each person in different four nations from 1967 to 2007. Overall, the average emission of the UK and Sweden decreased while those of Italy and Portugal inclined throughout the period.
Firstly, at the beginning of the period, it is obvious that people who live in the UK emitted the highest amount of carbon dioxide per person while Portugal was the least average emission among the four countries. The figures were about 11 metric tonnes and 1 metric tonne, respectively. As time passed, the average emissions decreased gradually in the UK, but the number of emissions in Portugal rose steadily throughout the period. Each figure reached to 9 tonnes and 5 tonnes per person.
Also, it is noticeable that Sweden had fluctuated over the period. Its average emission skyrocketed from 8 tonnes in 1967 to 11 tonnes in 1977, but the figure fell significantly to 7 tonnes in 1987. After this period, the number of emissions decreased gradually between 1987 and 2007. Finally, the figure in Italy was equal to 5 tonnes in Portugal. Meanwhile, the average emission of Italy showed a steady increase, its figure rose from 4 tonnes to 8 tonnes per person during the period.