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

The charts provide information on four factors that contributed to decreasing agricultural land productivity

along with

the affected areas (North America, Europe, and

Oceania

) in the 1990s.

Overall

, land degradation was dominantly caused by over-grazing,

deforestation

and over-cultivation,

while

salinization accounted for a small proportion.

In addition

, Europe was the most affected area, followed by

Oceania

and North America most of which happened because of

deforestation

, excluding

Oceania

. Regarding the effect of land degradation, Europe has affected just over 20% which consists of 5.6% of over-grazing and 7.7% of

deforestation

.

However

, the largest proportion was

deforestation

, reaching 8.4% which made

this

factor in the top position than other areas.

Furthermore

, North America was the least affected area which just accounting for less than 10%. Those three indicators just made up less than 3%, except over-grazing which accounts for 1.5%.

In contrast

, the over-grazing in

Oceania

stood at around 15% which was caused by 10.8% over-grazing, followed by 1% over-cultivation and 1.8%

deforestation

.