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

The pie chart depicts the factors responsible for land degradation worldwide. The table, on the other hand, gives a regional breakdown of this degradation during the 1990s.

Referring to pie chart, the principle factor responsible for unproductive land is over-grazing, which contributed almost 35% to land degradation. In addition, deforestation and over-cultivation accounted for 30% and 28% respectively. Other reasons are considerably lower at 7%.

It is quite illusive from the table that Europe had the highest deforestation rate of 9.8% followed by Oceania and North America with 1.7% and ...

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