The pie chart below shows the main reasons why agricultureal land becomes less productive. The table shows these causes affected three regions of the world during the 1990s.

The pie chart gives information about the

causes

of worldwide land degradation. The table illustrates the

causes

of land degradation in three main sectors.

Overall

,

it is clear that

Europe has the highest percentage of total land degraded and the main reason is deforestation,

whereas

over-grazing is the most important all over the world.

According to

the table, Europe accounted for the highest percentage of deforestation and over-cultivation, 9.8% and 7.7%, respectively.

Besides

,

this

area has the largest proportion in total, at about one-fourth per cent.

Also

, North America has the lowest percentage in total, exactly 5%. Oceania keeps

a

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second place among other regions and just gained 11.3% in over-grazing.

To begin

with, all of the three

causes

are investigated in the pie chart. As can be seen, over-grazing has gained just over one-third in total. Over cultivation and deforestation have approximately the same numbers, 30% and 28%.

Also

, other

causes

are just under 10 per cent.