The pie chart represents the percentage of factors that were responsible for unproductive land. The table indicates how these factors influenced North America, Europe and Oceania during the 1990s.
It is clear that there are three major causes of land degradation and animal grazing was the main one. Out of three regions, Europe suffered from the highest percentage of land degradation, while the proportion of unproductive land in North America was lowest.
As can be seen from the pie chart, 35% of land degradation was caused by over-grazing, which was the highest figure. Deforestation and over-cultivation constituted to a smaller percentage of unproductive farmland, at 30% and 28% respectively. On the other hand, the other factors affected only 7% of land degradation.
The impact of deforestation on Europe was more substantial than any of the other regions, with 9.8% of land affected. By contrast, deforestation accounted for the smallest percentage of land degradation in North America, at 0.2%. While over-grazing was responsible for the most significant degraded farmland in North America, at 3.3%, it had no influence on the land in Oceania. Oceania, however, suffered from 11.3 % of land degradation resulted from over-grazing, which was the highest figure in this category.