Band 7+: The pie chart below shows the main reasons why agricultural land becomes less productive. The table shows how these causes affected three regions of the world during the 1990s. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

The pie chart represents the proportion of land degradation causes mainly concerned worldwide while the table demonstrates the percentage of them in three particular regions in the 1990s.

Overall, it can clearly be seen that over-grazing was the most affected cause of land degradation globally, particularly found the most in the Oceania region.

Although over-grazing was the highest destructor of soil degradation worldwide with 35%, the discrepancies were not significant when compared to the other two factors, deforestation and over-cultivation at 30% and 28% respectively. However, it was five times higher than the least effect at 7%.

The highly degraded lands were found in Europe with 23%, of which the biggest portion was caused by deforestation at 9.8%. Conversely, there were noticeably less productive fields in North America, accounting for 5%. In Oceania, only the over-grazing percentage was nearly two times higher than that in Europe whereas the others were considerably less than around eight times that of the European region.