The line graph illustrate the amount of CO2 emitted per person in 4 countries from 1967 to 2007.
Overall, while CO2 emissions in the United Kingdom and Sweden experienced upward trends, the opposite was true for Italy and Portugal. In addition, that of the United Kingdom was consistently the highest during the given period.
Initially, the amount of CO2 emitted per person in the United Kingdom was roughly 11 tonnes, significantly higher than that of Sweden, which was around 9 tonnes in 1967. Over the next 10 years, the figure for Sweden increased substantially, reaching a peak of approximately 11 tonnes in 1977, then witnessing a dramatic decline and eventually fell to nearly 5 tonnes in 2007. Additionally, the quantity of CO2 released in the United Kingdom declined moderately by roughly 3 tonnes and reached above 8 tonnes in the last year.
Regarding to other countries, in 1967, Italy emitted nearly 4 tonnes, compared to Portugal, which was only 1 tonnes. During the following years, the figures for both nations increased significantly and eventually gained roughly 8 tonnes for Italy and 6 tonnes for Portugal in 2007.