The pie chart shows the main reason why agricultural land becomes less productive. The pie chart shows the main reason why agricultural land becomes less productive.

The pie diagram presents information on reasons for the declining productivity of agricultural lands

whereas

the table depicts data on how

this

affected different continents of the world in the 90s.

Overall

, over-grazing affected crop productivity the most globally, especially in Oceania

whereas

Europe's land was subject to the most degradation out of all the three regions, mostly by deforestation.

Firstly

, over-grazing contributed to more than one-third of the world's causes for land destruction, followed by widespread clearing of trees and excessive cultivation constituting about a third and over a fourth of the reasons respectively.

Secondly

, over-grazing affected over a tenth of the land in Oceania, which is the highest for any region

although

over-cultivation had no impact on the area.

Additionally

, about a tenth of Europe's crop productivity is majorly decreased by deforestation

while

it had less than 1% impact on the fields of North America. In total, North America was the least affected by these causes of declining crop harvest.