Deforestation in agricultural lands areas (IELTS preparation) 

During the 1990s the unproductivity of the agricultural lands had already started to become a tendency worldwide. The reasons why this is happeninged are plenty, but as the main causes of deforestation--over-cultivation and over grazing--have to be (OR: "must be" sounds more formal) highlighted.

But the Land degradation is produced by has different causes depending on the different local environmental conditions. In order to achieve a general vision of the problem three different global regions have been chosen. (You should summarize the three regions here) Moreover, In this way the different roots of this topic can be fully analyzed. Otherwise, a partial vision would be concluded (OR: "the analysis would be incomplete").

Firstly, it has to been exposed found that the zone with more the most land degradation is Europe (23%), being North America being the one area with the least degradation percentage on this issue. Furthermore, it has also been identified as a less common cause in North America. (I don't understand these sentences. Europe has the most degradation, and North America has the least. Or does North America simply have less than Europe, but not the least?) Secondly, the fact that over-grazing is one of the two most common reasons of the land degradation in Europe and Oceania. It should be taken into consideration that these ones areas also experience some of the most in which this problem is more severe environmental degradation has to be taken in consideration.
As a In conclusion, land environmental degradation is an international problem which occurs in different parts of the planet (OR: "affects different parts of the world"), but also attempting can be attributed to several a variety of unique causes. Although a general reason pattern of the main effects can be found it is essential to have a look at the diversity of each planet environmental zone in order to fully understand the problem.