IELTS TEST TASK 1 WRITING (2) The graphs show the reasons for worldwide land degradation and how these causes affected three regions of the world over the period of 1990s. The cause of over-degradation had the highest proportion of worldwide land degradation at 35%,while the causes of deforestation and over-cultivation shared 58% in total of worldwide land degradation. According to the table below, the proportion of total land degraded affected the Europe most at a degree of 23%, but only with 5% in North America. And in general, the causes of over-cultivation and over-grazing were quite common in Europe.But the cause of over-grazing in Oceania was relatively serious than other regions. Especially, over-cultivation was not exsisted in Oceania with a percentage 0. To conclude, the major reason for worldwide land degradation was over-grazing, and obviously Europe suffer most, but less in North America and Oceania.