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 comparison where relevant.
global farmland degradation and its consequences
The chart illustrates the causes of global farmland degradation. The diagram gives information about how North America, Europe and Oceania were influenced by these causes in the 1990s.
The over-exploitation of land is the major reason for degradation of farmland, with over-grazing and over-cultivation accounting for 35% and 28% respectively. A further 30% of degradation was due to tree clearance, while other reasons are only responsible for the remaining 7%.
Among the three regions in question, Europe suffered the most. It had as much as 23% degraded land, in which 9.8% were caused by deforestation, followed by over-cultivation(7.7%) and over-grazing(5.5%). For Oceania, over-grazing constituted 11.3% in its 13% of total land degraded, leaving only 1.7% for deforestation. North America had a lower degree of land degradation at 5%, with 3.3% caused by over-cultivation and 1.5% by over-grazing.
Overall. The different causes of land degradation had a largely varying impact on different regions. The main culprit in Oceania was over-grazing, while North America and Europe suffered the most from over-cultivation and deforestation respectively.