Band 6+: The pie chart below shows the main reasons why agricultural land become lesson productive. The table shows how these causes affected three regions of the world during the 1990s.

Some causes have been identified through land degradation; The pie chart illustrates in what amount each causes has affected the land. For additional information, there is a table that include some data about how the variables impacted North America, Europe, and Oceania.

Overall, the main factors of land degradation are over-grazing and deforestation by amounts of 35% and 30% respectively. Total land degraded in Europe, by an amount of 23%, is much higher than two other areas.

There are 3 factors mentioned in which why land becomes less productive: over-grazing, deforestation, and over-cultivation. The percentages of all causes are near to each other: 35% for over-grazing, 30% for deforestation, and 28% for over-cultivation.

In North America, over-cultivation is the main factor that involved in total land degradation by 5%, the least amount of degradation among other regions. However, in Oceania, over-cultivation did not a cause of this disaster; The main cause in this area is over-grazing by 11.3%. The most affected region is Europe by 23% of degradation, and the most important cause in Europe is deforestation.