The pie chart illustrates the causes of land deterioration, while the bar chart shows information about three regions North America, Europe, and Oceania and their land degradation in 1990.
Looking at the data overall, it is evident that the major reasons of agricultural land degradation worldwide are over-grazing, over-cultivitation, and deforestation. Among these, over-grazing has the most significant effect in Oceania.
To begin with, it is clear that there are three causes with percentages above 27%. Over-grazing is the biggest cause at 34%, followed by deforestation at 30%, and finally over-cultivation 28%. While the lowest percentage of effect is only one effect below 10%, namely salinization at 8%.
On the other hand, in the 1990 Overgrazing was the main cause and had a significant impact in Oceania at 10.8% almost ten times with the other impacts in Oceania, they were only approximately 1% to 1.8%. In Europe, over-planting, over-grazing, and deforestation show no significant difference between the three, with deforestation at 8.4%, over-planting at 7.7%, and over-grazing at 5.6%. In North America, the largest effects of degradation of land were over-cultivation, and deforestation around 3.0% to 3.3%, unlike salinization just 1.5%.