A glance at the line graph reveals average carbon dioxide (COz) emissions per person in four different countries, which are the United Kingdom, Sweden, Italy and Portugal during 1967 to 2007.
Overall, there was a gradual increase in Italy. Similarly, the number of CO2 emissions in Portugal also showed a steady increase, whereas the CO2 emissions in the UK constantly decreased. What is more, the CO2 emissions in Sweden first increased slightly, then constantly declined.
In 1967, the number of CO2 emissions per person in the UK used to be the largest overall, at about 11, and it then gradually dropped to almost 8. Similarly, in Sweden, also experienced a drop, but first the CO2 emissions increased from about 9 in 1967 to over 10 in 1977, at this time reached its peak, and then decreased gradually from over 10 to almost 6, finally equal to the emissions of Portugal in 2007.
On the other hand, there were significant increases between Italy and Portugal. As we can see, from 1967 to 2007, the emissions in Italy which increased from over 4 per person to almost 9 per person, were constantly larger than it in Portugal which increased from almost 2 per person to about 5 per person in 2007.