global water use by sector
The given graph illustrates the amount of water used by sector globally each year in the 20th century, while the table compares the water consumption in Brazil and Congo in 2000. Overall, it can be seen that the amount of water used in all 3 sectors worldwide sky-rocketed in this period and the water consumption in Brazil is significantly bigger than in Congo.
To begin with change in global water use in the period of 1900-2000, at first, water was used mainly in agriculture, this sector used approximately 500 km3 of water while these figures of the two other sectors were nearly equal to zero. However, the rising trend was sustained year by year in every sectors. As a result, in 2000, industrial use and domestic use approached the number of 1100 km3 and 200 km3 respectively. Agriculture remained the major-used sector and consumed more than 3000 km3 of water at the end of the 20th century.
Secondly, the consumption of water was not only totally different among sectors but also among countries. This difference may be brought about due to the irrigation system in each country. As we can see from the table, the area to construct irrgation system in Brazil in 2000 was about 26,500 km2, which was 265 times bigger than in Congo. Consequently, the water consumption per person was nearly 360 m3 while this number of Congo was only 8m3.
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the graph and table