The pie chart and table provide information about four key causes of soil erosion and their influence on North America, Europe, and Oceania over the 1990s.
Overall, three main aspects affected to agriculture were deforestation, over-cultivation, and overgrazing. It is seen that the percentage of degraded land in the European region was the greatest compared to all remained zones.
Overharvesting is the main cause of land degradation; the percentage of its influence was over a third of the total. The figure for removal of trees was about one-third of the total, while that for excessive cultivation was less than 30 %. The rate of other reasons that influenced the productivity of land was a tiny 7 %.
The main problem for North America was over-growing, more than 3 % of total land became less productive because of that. However, that factor was not affected to Oceania at all, but approximately 11% of total deteriorated land by the reason of grazing. Removing of tree cover in Europe undesired almost 10 % of the total land. 
The pie chart and table provide information about four key causes of soil erosion and their influence on North America, Europe, and Oceania over the 1990s.
 Overall
, three main aspects  
affected
 to agriculture were deforestation, over-cultivation, and overgrazing. It is  
seen
 that the percentage of degraded  
land
 in the European region was the greatest compared to all remained zones. 
Overharvesting
 is the main cause of  
land
 degradation; the percentage of its influence was over a third of the  
total
. The figure for removal of trees was about one-third of the  
total
, while that for excessive cultivation was less than 30 %. The rate of other reasons that influenced the productivity of  
land
 was a tiny 7 %. 
The
 main problem for North America was over-growing, more than 3 % of  
total
  land
 became less productive  
because
 of that.  
However
, that factor was not  
affected
 to Oceania at all,  
but
 approximately 11% of  
total
 deteriorated  
land
 by the reason of grazing. Removing of tree cover in Europe undesired almost 10 % of the  
total
  land
.