The pie chart shows the main rationale why agricultural land becomes less productive. Meanwhile, the table shows data about the causes of mentioned problems in three major regions in the year 1990.
Overall, it is clear from the pie chart that, almost the same ratio can be seen in three causes of global degradation (Over-grazing, deforestation, over-cultivation).
Overall, we can also see from the bar chart that there were significantly more less productive land in Europe compared to its counterparts.
Looking at the pie chart first, 35% of overall land degradation on a global scale was over-grazing, whereas, deforestation also emerges as a prominent cause of land degradation, representing a substantial percentage in the pie chart depicting worldwide trend. While, over-cultivation part took 28% total amount and 7% for other fields with the least percentage.
Turning to the reasons of land degradation across three regions, Europe suffered the most from degraded, at 23% whereas 13% of Oceanian and 5% of North American lands were degraded as a whole. 9.8 % of land in Europe was spoilt by deforestation while the numbers for Oceania and North America were 1.7 and 0.2% respectively. In Europe, 7.7% of lands were degraded because of over-cultivation, followed by 3.3% for North America. Oceania, however, had no spoilt lands in this case. Interestingly, the percentage of degraded lands in Oceania due to over-grazing was relatively higher among three regions, at 11.3%, twice as much that in Europe (5.5%), the figure for North America was just 1.5%.