The pie chart gives information about unproductive land due to 4 key factors, while the table gives a breakdown of the effect these causes had on agricultural land in three regions during the 1990s.
Overall, over-grazing, deforestation, and over-cultivation are all significant causes of land degradation globally, but the causes of less productive land in specific regions.
The pie chart shows that over-grazing by livestock is the most significant factor in land becoming degraded with 35% of land being affected in this way. However, this is closely followed by deforestation 30% and over-cultivation 28%, with the remaining 7% being made up of other causes
With respect to the table, it is clear that in the 1990s the North American region had the lowest amount of degraded land at just 5%. Of this land, about two-thirds was damaged by over-cultivation, just under a third by over-grazing, and a minimal amount by deforestation. In contrast, at the same time almost a quarter of arable land in Europe was degraded. Unlike the American region, the main factor in Europe was deforestation, with 9.8% of total land affected in this way. Moreover, over-cultivation and over-grazing were also majorly responsible for the deterioration of land quality. In the final region, Oceania, the main cause of land degradation was clearly over-grazing with 11.3% of land being affected by this out of a total of 13% of land degraded in total. Conversely, over-cultivation appeared to play no role in this part of the world, while deforestation affected only a relatively small amount at 1.7%