The graph below shows average carbon dioxide (CO2) emissions per person in the United Kingdom, Sweden, Italy and Portugal between 1967 and 2007

The line graph provides information about the average emissions of carbon dioxide per person in four countries from 1967 to 2007. Overall, it is clear that although the UK produced the most CO2 per capita, output fell there and in Sweden over the period. Meanwhile, there were significant rises in the emission levels from people in Italy and Portugal. In 1967, people in the UK were the biggest polluters, responsible for almost 11 metric tonnes of CO2 each. The next highest emitters were the Swedes, with around 8. 5 metric tonnes each, which was almost double the output of the average Italian, and sixteen times more than a person in Portugal. CO2 output fell steadily in the UK over the next forty years, however, and despite a surge in the 70th, people in Sweden also cut their emissions dramatically until by 2007, they accounted for only around 5 metric tonnes each. By contrast, after 1967, emissions increased from Italy and Portugal. By the end of the given period, Italy was the second highest polluter, with almost 8 metric tonnes, and in Portugal, though it was still the lowest emitter along with Sweden, just under 6 metric tonnes per person were generated.