How much of the natural land is left undeveloped by humans?
What is in bold is almost certain and fairly accurate. The underlined portions are relative and would likely overlap although I am not sure to what extent.
Surface Of the Earth:
10% agriculture/farming/animals for profit
9% forests and falling
7.5% mountains (“Living In The Environment” by G.Tyler Miller ,Jr)
3% urban areas (DEVELOPED)
i think maybe its 3%. not so sure
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