The given line graph depicts the mean green house gas productions individually in Britain, the Swedish, the Italian and the Portuguese in 40 years of period from 1667 to 2007.Units are measured in metric tonnes.
From a broader viewpoint, it is clear that (the nations to increase in carbon dioxide footprint were Italy and Portugal, while the USA, Sweden decreased over the given period.)the graph is that there were considerable upward trends in the emission of both Italy and Portugal, while the USA, Sweden saw a significant downward tendency over the given period. Furthermore, the Swedish carbon dioxide emission overlapped with Italy and Portugal in 1990 and 2007 respectively.
Looking at the details, as regards Portugal, emission was the lowest among the four at just under 2 in 1967, which then went up significantly, finishing at almost 5 over the next decade, at which point it leveled off until the end of the period. In terms of Italy, the trend was similar.The trend in the beginning accounted for just over 4,went up considerably to 6 metric tonnes, kept on decelerating to end up at slightly under 8.
By contrast, the emissions of Sweden and the United Kingdom went in the opposite direction. The greenhouse gas production of the UK had the highest at approximately 11 in 1967, after which experienced a steady plummet and was shown to end up at 9 in 2007. Similarly,the Swedish initiated from from slightly over 8 to decline gradually for the next 40 years to conclude at almost 5 except for a considerable growth between the years of 1967 and 1977.