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

Linking Words

the affected areas (North America, Europe, and

Oceania

Use synonyms

) in the 1990s.

Overall

Linking Words

, land degradation was dominantly caused by over-grazing,

deforestation

Use synonyms

and over-cultivation,

while

Linking Words

salinization accounted for a small proportion.

In addition

Linking Words

, Europe was the most affected area, followed by

Oceania

Use synonyms

and North America most of which happened because of

deforestation

Use synonyms

, excluding

Oceania

Use synonyms

. 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

Use synonyms

.

However

Linking Words

, the largest proportion was

deforestation

Use synonyms

, reaching 8.4% which made

this

Linking Words

factor in the top position than other areas.

Furthermore

Linking Words

, 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

Linking Words

, the over-grazing in

Oceania

Use synonyms

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

deforestation

Use synonyms

.