The line graph illustrates information about the changes in the average CO2 emissions per person in four different countries, namely United Kingdom, Sweden, Italy, and Portugal, over the period from 1967 to 2007.
Overall, it is immediately apparent that Italy and Portugal experienced the most significant growth over the period, whereas United Kingdom showed a noticeable decline. Meanwhile, Sweden fluctuated moderately, although Italy surpassed Sweden.
Turning to the details, United Kingdom started at approximately 11 metric tonnes in 1967 and experienced a gradual downward trend throughout the period, falling to nearly 9 metric tonnes by 2007. In contrast, Sweden began at roughly 8 metric tonnes in 1967 and fluctuated slightly during the first half of the period, before declining marginally towards the end. By 2007, the figure for Sweden stabilized at around 6 metric tonnes.
Regarding the remaining countries, Italy stood at around 4 metric tonnes in 1967 and increased steadily, reaching approximately 5 metric tonnes in 1987. This upward trend continued, as the figure peaked at roughly 6 metric tonnes by 2007. Similarly, Portugal commenced at nearly 1 metric tonne in 1967 and rose sharply throughout the timeframe, ending at around 5 metric tonnes by 2007.
It also noteworthy that Italy overtook Sweden in 1987.