The provided line chart illustrates the carbon dioxide(CO2) emissions per person in the United Kingdom, Sweden, Italy and Portugal during 1967 to 2007.
Overall, the UK emitted most carbon dioxide to the environment. In contrast, the Portugal emitted least carbon dioxide to the environment.
As for the line chart, the UK emitted around 11 tons of carbon dioxide per person every year steadily during 1967 to 1977. This is followed by decreased from 11 to 9 tons between 1977 and 2007. Moreover, the carbon dioxide emissions of the Sweden grew regularly from 9 to 10 tons during 1967 to 1977. After that, it declined rapidly to 7 tons between 1977 and 1987. Furthermore, it dropped steadily to around 5 tons between 1987 and 2007.
In terms of the Italy , the emissions of carbon dioxide raised regularly from around 4 to 6 tons during 1967 to 1977. Then it grew slowly to around 8 tons between 1977 and 1997. Additionally, it remained steady during 1997 to 2007. In addition, the emissions of carbon dioxide of the Portugal climbed gradually from around 2 to 4 tons between 1967 and 1987. This is followed by increased dramatically during 1987 to 1997. Also, it remained steady similarly with the Italy during 1997 to 2007.