The graph shows information about how much carbon dioxide is emitted per person in four different countries over a forty-year duration amid 1967 and 2007.
Overall, what stands out from the graph is that there were considerable upward trends in the emissions of both Italy and Portugal, while emanations of the UK and Sweden saw a substantial fall over the period in question. Another interesting point is that there was a dramatic rise in Sweden over a period of decay midst 1967 and 1977, but it fortunately declined later.
Looking at the details, as regards Italy and Portugal, the amount of emissions increased drastically. That is; in Italy, it rose from 4 metric tonnes to 8 between 1967 and 2007 and in Portugal, it went from 1 to 5.5 metric tonnes.
By contrast, the emissions fell in other two states in such a way; in the United Kingdom, it dropped from 11 to 9 and in Sweden, it declined from 10 to 5.5 metric tonnes.