But due to overgrazing , erosion , and other environmental factors , half of the world 's rangeland is now lightly to moderately degraded , and 5 % is severely degraded .
Much of the world depends on grassland for the grazing of domestic livestock .
Due to overgrazing , erosion , and other environmental factors , half of the world 's rangeland is now lightly to moderately degraded , and 5 % is severely degraded .
Much of the world depends on grassland for the grazing of domestic livestock .