If by land mass you mean the surface, then 99% is habitable.
Transformation habitable land into desert.
60
18%
An island is a habitable area of land surrounded by water. An islet is an inhabitable small area of land surrounded by water. A cay (or key) is a habitable small area of land surrounded by water.
Earth is habitable because of our natural resources. Water, and land capable of growing food. Our atmosphere is perfect for life. The sun is the perfect distance away.
the building of dams
the building of dams
Desertification: The Gradual transformation of habitable land into deserts; usually caused by climate change or by destructive use of the land also, the definition of desertification is:"The transformation of arable or habitable land to desert, as by a change in climate or destructive land use."
It realtes to it because the land there is habitable, but may change to desert, as by a change in climate or destructive land use.
About 15 billion acres, some 20% of the earth's land mass is today considered habitable. That makes 80% at present inhabitable: Antarctica, deserts, mountains and wilderness. But as the case of the Amazon forests shows, forests can be bulldozered and wilderniss can be made habitable. So the figure only reflects today's land needs and state of technology.
is a rainforest habitable