Iraganeko Oihartzunak

Lurzorua, baliabide ugaria ala eskasa da?

Lur emankorra arnasten duzun airea bezain garrantzitsua da.

Baina, planetako baliabide ugaria da ala urritzen hasten da?

Z=1

F = B+(D/2)

I = 2A

N = C-(D+B)

Zenbat milioi hektarea lur emankor daude munduan?

 

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