The graph illustrates the average carbon dioxide emissions per person in the United Kingdom, Sweden, Italy, and Portugal from 1967 to 2007.
Overall, Portugal consistently had the lowest emissions throughout this 40-year period, while the United Kingdom recorded the highest levels. Additionally, Sweden experienced a significant decline in emissions after the first decade, particularly notable after 1977. In contrast, Italy’s emissions plateaued during the final ten years, showing no significant change.
Focusing on Portugal, it maintained the lowest carbon dioxide output among the four countries, with its emissions remaining stable over the years. By 2007, Portugal’s emission levels were nearly matched by Sweden, which indicates a remarkable improvement in Sweden’s emissions reduction efforts. The United Kingdom, however, consistently had the highest emissions from 1967 through 2007, demonstrating a steady trend with little fluctuation over time. Meanwhile, Italy saw a steady increase in emissions during the first 30 years, but this growth stagnated in the last decade, indicating a shift in its carbon output patterns.