The graph illustrates average CO2, which was produced per person in the UK, Sweden, Italy and Portuguese from 1967 to 2007.
It is immediately obvious that the figures for the UK and Sweden saw downward trends from 1967 to 2007, while other countries experienced upward trends at the same period of time.
As can be seen, in the UK, around 11 metric tonnes CO2 were produced in 1967, which was the highest figure. In addition, it remained stable at 11 metric tones for 10 consecutive years. Afterwards, it decreased considerably and reached approximately 8.5 metric tonnes in 2007. In Sweden, every person produced roughly 8.5 metric tonnes in 1967. Although it increased incredibly by about 2 metric tonnes and peaked at 10.5 metric tones, it returned to less than its ordinal level in 1977 and went down continuously. Finally, it dipped at almost five metric tonnes in 2007.
According to the data, Portuguese citizens caused CO2 emissions less than other areas in 1967, it was under two metric tonnes. However, it went up rapidly and reached around 4.5 metric tonnes in 1997 and stayed static at that level between 1997 and 2007. Moreover, the figure for Italy fluctuated widely during that period of time, and dipped and peaked in 1967 and 2007, respectively. Generally, it had an obvious increase of about 4 metric tonnes from 1967 to 2007.