The provided illustration presents the average carbon dioxide emissions per capita in the United Kingdom, Sweden, Italy, and Portugal from 1967 to 2007, measured in metric tonnes.
Overall, the graph displays varying trends in CO2 emissions across the four countries during the forty-year period. While Italy and Portugal witnessed an increase in emissions, the United Kingdom and Sweden experienced a decline. Notably, Sweden’s emissions intersected with those of Italy and Portugal in 1990 and 2007 respectively.
Portugal had the lowest emissions at just under 2 metric tonnes in 1967, which surged to almost 5 by 2007 with a gradual increase over the years. Similarly, Italy began at approximately 1 metric tonne in 1967, peaked at nearly 4 by 1997, and then decreased slightly to just below 7 by 2007.
In contrast, the United Kingdom started at around 11 metric tonnes in 1967, dropping to below 9 by 2007. Sweden commenced at 8 tonnes, declined to about 6 by 1977, experienced a minor increase to 7 by 1987, and then decreased to slightly above 5 by 2007. Moreover, Sweden’s emissions decreased by 3 in 1987 and eventually converged with Portugal at just under 6 metric tonnes in 2007.