The line graph illustrates the average amount of carbon dioxide emissions per person in four distinct countries (the United Kingdom, Sweden, Italy, and Portugal), over a 40-year period, from 1967 to 2007. The measured units are present in metric tons.
Overall, in Italy and Portugal, the average rate of CO2 emission was increased throughout the period, following the same pattern. While Britain experienced a decline, Sweden saw a rise until 1977, and after that, it plummeted steadily.
To begin with, starting from around 2 metric tonnes and 4 metric tonnes in 1967, respectively, both Italy and Portugal faced a huge rise in the release of carbon into the atmosphere, resulting in almost 8 metric tonnes and 6 metric tonnes, significantly in the year 2007. In addition, despite Sweden reaching a peak in 1977, later there was a drastic fall until 2007, which resulted in the intersection with Portugal.
Regarding the United Kingdom, the highest emission of carbon dioxide into the surrounding environment nearly decreased its value to 9 metric tonnes in 2007. Although there was a considerable difference in releasing rates, Italy and Portugal followed a similar pattern over the course of 40 years.