The line graphs illustrate average C02 emissions per person in the four countries between 1967 and 2007. The countries include United Kingdom, Sweden Italy and Portugal.
From the line graphs, it can be seen that the highest amount of carbon dioxide emissions was in United Kingdom and the lowest was in Portugal in the same year of 1967.
In 1967, United Kingdom saw the peak in C0¬2 emissions, and it was about 11 metric tons per person. It slowly decreased to 8.5 metric tons in 2007. On the other hand, for the transition from 1967 to 1977, the line graph of Sweden saw a significant jump of 2 metric tons but then it got down rapidly from 1977 to 1987. After that, the line saw another reduction for the years between 1987 and 2007 and got down 5.7 metric tons.
Italy and Portugal saw an almost similar type of trend. For Italy, it was 4.3 metric tons in 1967, then it was 6.4 metric tons in 1977. Then, it saw a steady increase between 1977 to 1997. After that, there was no change in pattern for the line and it remained stable at 7.7 metric tons. Whereas for Portugal, the value got up steadily from 1.5 to 2.7 between 1967 and 1987, then saw a significant jump for the next 10 years and reached 4.6 metric tons. The emissions of C02 in the last years were stable at 5.7 metric tons.