The pie chart below shows the main reasoans of why agricultural land becomes productive. The table shows how these causes affected three regions of the world during the 1990s. v.2

The pie chart illustrates the main factors of worldwide land deforestation and the table represents how to spread those factors in three different regions(North America, Europe and Oceania) in the world in 1990. Overall, according to the pie chart, the major reason for the decline in agricultural production was overgrazing and the region of have been greatest effected of agricultural land was Europe. In addition, the percentage of overgrazing in the worldwide land was 35%and also the proportion of deforestation was 5% less than overgrazing. Furthermore, became the third place of a factor of land degeneration was over-cultivation and next to other reasons that the quantity of those reasons were 28% and 7% respectively. On the other hand, Oceania where is the large group of island in the south pacific including Australia and New Zealand have been set down by over-cultivation in 1990. However, Europe has been increased the quantity of cutting trees among other areas that was approximately 10%. Indeed, the lowest percentage of wastage land degeneration constituted in North America.