why agricultural land becomes less productive
The pie chart compares the important reasons for the decrease in productions in agricultural land, and the table illustrates three different geographical zones
which affected by those reasons between 1990 and 1999. It is clear that over-grazing significantly causes globalization land degradation. We can also see that overall Europe lands were affected more than North America and Oceania. according to the pie chart, over-grazing and deforestation are the markable reasons that result in agriculture productions, with 35% and 30% respectively. The second main reason is over-cultivation, with 28%. only 7% of other causes impact on land degradation across the world. Looking at the table, we can see 23% of European lands were degraded in which it was the most degraded lands in the world. Oceania with 11.3% lost most of its land because of over-grazing that it was the largest amount of land that destroyed worldwide. While only 5% of North American lands vanished during the 1990s by three various degradation reasons.
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