IELTS TASK1 The pie chart illustrates the four main causes of land degradation in the world and the table shows the percentage of four reasons for that in North America, Europe, and Oceania in the 1990s, which is a large group of islands in the South Pacific including Australia and New Zealand. Overall, one of the most important causes of the less productive land was over-grazing, and the top 2 reason was deforestation. In total, Europe had the most serious land degradation problem, made up 23%, while North America had the least, only was 5%. The most serious reasons for land became less productive was over-grazing, which accounted for 35%. Deforestation and over-cultivation were the next two, which was 30% and 28% respectively. North America had a little bit of percentage of land degradation, which was 0.2% in deforestation, 3.3% in over-cultivation, and 1.5% in over-grazing. While in Oceania, the figure of over-grazing was the highest, which was 11.3%, in the three regions. It also held the least percentage of over-cultivation, which was literally zero. Europe had almost the most serious problem which showed 9.8%, 7.7%, and 5.5% respectively in three different causes.