The pie charts below shows the main reasons why agricultural land becomes less productive. The tables shows how these causes affected three regions of world during the 1990s.

The pie chart and table illustrate some information about the causes of

land

degradation and its effects on three different regions of the world in the 1990s.

Overall

, over-grazing was the biggest reason for worldwide

land

infertility.

However

, the opposite was true for

Oceania

. To be more specific, the major reasons why worldwide

land

became less productive were over-grazing and deforestation at 35% and 30% respectively. Followed by over-cultivation at 28%. The other cause was responsible for damage

of

Change preposition

to

show examples

7% of the

land

.

While

looking at the table, 0.2 and 0% of deforestation and over-cultivation were two minor causes of

land

degradation in North America and

Oceania

respectively.

Whereas

, in

Oceania

and Europe, over-grazing and deforestation were the biggest reasons for

land

infertility. The % of total

land

that becomes less productive for all reasons was at 5%,23% and 13% for North America, Europe and

Oceania

respectively. In the North American region, over-grazing is the mild cause at 1.5 for less fertility of agricultural

land

.