Thu Nguyen The line graph shows the changes in the emissions of carbon dioxide in countries over a period of 47 years starting from 1967 It is clear that the amount of carbon dioxide emission in the United Kingdom was by far the highest over the period shown From 1967 to 2007, there was a significant fluctuation in the production of CO2 in Sweden while the figures for Italy and Portugal increased The emission of carbon dioxide in the United Kingdom in 1967 was about 10.5 tones, and then it decreased gradually to around metric tonnes in 2007 The emission in Sweden started roughly 8.5 metric tonnes in 1967, reaching a peak at 10.5 metric tonnes in 1977 before slumping to over metric tonnes in 2007 In 1967, the productions of carbon dioxide emissions in Italy and Portugal were about 4.2 metric tonnes and 1.7 metric tonnes relatively The figure for Italy increased to about 7.8 metric tonnes in 1997 and remained unchanged 10 years later The amount of carbon dioxide emission in Portugal still held the lowest position, reached under metric tonnes in 2007