carbon dioxide emission This line graph illustrates the amount of carbon dioxide emission released by four countries per capita for forty consecutive years from 1967 to 2007. There was a marked reduction in Swedish’s emission of roughly 5 metric ton after reaching its peak at just over 10 metric ton in 1977. Similarly, the British’s carbon dioxide emission went down minorly from approximately 11 metric ton in 1967 to nearly 9 metric ton in 2007. On the other hand, the Portuguese people’s emission experienced a surge, which accounted for around 1 metric ton in 1967 then increased to 4.75 metric ton in the following 40 years. The emission of Italian people made up around 4 metric ton in 1967. After exceeding Swedish citizens’ emission in 1987, the Italian citizens’ emission climbed to well over 7 metric ton in 2007. Overall, the emission of British and Swedish people was on a downward trend whereas this of Italian and Portuguese citizens was inclined to rise.