The graph below shows average carbon dioxide emissions per person in the United Kingdom, Sweden, Italy and Portugal between 1967 and 2007. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

The line chart provides data on the average extent of carbon dioxide discharged by humans in the United Kingdom,

Sweden

, Italy and Portugal from 1967 to 2007.

Overall

, in the United Kingdom and

Sweden

, the total of carbon dioxide released was reduced over the period

whereas

in Italy and ,Portugal it witnessed an upward trend. Starting with roughly 11 metric

tonnes

of emissions in 1967, the United Kingdom fell to approximately 9 in 2007.

However

, it still stood at the top of the rate.

Although

Sweden

saw a significant surge in 1977, from around 9 to more than 10 metric

tonnes

, it later decreased dramatically in 1987 and progressively drop to almost 6 metric

tonnes

in 2007. From more than 4 metric

tonnes

in 1967, Italy reached about 6 metric

tonnes

in 1977 and remained unchanged from 1997 to 2007 with nearly 8 metric

tonnes

. There was a gradual rise from 1967 to 1987 in Portugal, which witnessed a remarkable growth in the rate of carbon dioxide released in 1997 with more than 5 metric

tonnes

per person and ended up with the same amount as

Sweden

in 2007.