The graph displays the average carbon dioxide (CO2) emissions per person in several European countries—namely the United Kingdom, Sweden, Italy, and Portugal—over the period from 1967 to 2007, grouped by decades.
According to the graph, Portugal has the lowest CO2 emissions, starting at approximately 1.5 metric tonnes and gradually increasing to just below 6 metric tonnes from 1967 to 2007. In contrast, the United Kingdom shows the highest per capita CO2 emissions, beginning at around 11 metric tonnes in 1967 and gradually decreasing to 9 metric tonnes by 2007. Sweden experienced a significant increase in emissions during the period from 1967 to 1977, reaching over 11 metric tonnes by the end of 1977. However, emissions then decreased to about 4 metric tonnes by the end of 2007. The data for Italy indicates a slight increase in emissions, rising from 4 to 8 metric tonnes during this timeframe.
In summary, the line graph indicates that the United Kingdom has the highest CO2 emissions, although they are on a decreasing trend, while Portugal has the lowest emissions, with an increasing trend. Italy and Sweden exhibit moderate emissions when compared to these four countries.