11. Land degradation by stock grazing has reduced numbers of burrowing seabirds.12. Mounds are not constructed in undisturbed regions where land degradation has not occurred. 13. Vegetation shifts from non-poisonous to poisonous plants seem to correlate with increased land degradation . 14. This is exacerbated by land degradation and impervious urban areas. 15. High population density is not always related to land degradation . 16. This economic analysis will enable decision makers to take appropriate measures combat land degradation globally. 17. The country also faces land degradation after forests stripped for agriculture resulted in soil erosion. 18. Land degradation is an important factor of internal displacement in many African and Asian countries19. In " Land Degradation and Society " ( 1987 ) the approach received further development. 20. Continued land abuse during droughts, however, increases land degradation .
