The line chart illustrates common carbon dioxide (CO2) emissions per person in the United Kingdom, Sweden, Italy and Portugal from 1967 to 2007.
Overall, average emission of CO2 experienced different trends over the period. While CO2 emissions of Italy and Portugal had an upward tendency throughout 40 years, UK and Sweden witnessed a downward trend in emissions for the majority of the period.
It can be seen from the graph, that carbon dioxide in Portugal was released about 1.3 metric tonnes in 1967, and followed by substantially increase to 5.2 metric tonnes in 1997. Regarding Italy, pollution also gradually rose from 4.2 to 7.8 metric tonnes during first three decades. Then the number of CO2 remained stable over the last decade in both countries. Focusing on Scandinavian country, the graph indicates the substantially decrease from 10.3 to 5.3 metric tonnes between 1977 and 2007, after growth during the first decade. As is shown by the chart, that Sweden and Portugal experienced similar release of CO2 by 2007. Looking at Great Britain, the level of CO2 witnessed a slightly decline from 10.5 to 8.5 metric tonnes. Furthermore, it is obviously that the highest amount of pollution observed in United Kingdom.