The area evaluated in the forest vulnerability assessment has nearly 19 million acres of forest land, 85 percent of which is owned by private individuals and organizations. (sciencedaily.com)
Just 18 percent of national forest land is permanently protected wilderness, and much of that is thin soil over rock where trees rarely grow. (discovermagazine.com)
Because of the clearing of pasture and forest lands for agriculture. (religion-online.org)