11.   The question arises as to why there is so little official action to combat soil erosion.

12.   There are problems related to the complex and varying manner in which symptoms of soil erosion appear through time.

13.   We infer that they accumulated during periods of accelerated soil erosion.

14.   Much of the country has already been clear-cut, and soil erosion has been extensive.

15.   Risks to the environment include pollution, damage to flora and fauna and soil erosion.

16.   Each member country presented a report to the summit, from which desertification, soil erosion and deforestation emerged as the main problems.

17.   Pollution, mining, uncontrolled tourism and soil erosion caused by logging are to blame.

18.   Although the increase in rainfall would aid irrigation, it would add to the problems of soil erosion and nutrient leaching.

19.   The practice of cutting wood for cooking fires has led to substantial deforestation and resultant soil erosion.