IRRIGATION
ancient system still working: g93 2/22 21
artificial glaciers (India): g01 4/8 31
desertification from faulty: g97 2/8 17
overirrigation: w90 7/1 4
Sahara: g88 2/8 30
Saudi Arabia: g90 1/22 29
use of sewage: g05 6/22 28
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IRRIGATION
ancient system still working: g93 2/22 21
artificial glaciers (India): g01 4/8 31
desertification from faulty: g97 2/8 17
overirrigation: w90 7/1 4
Sahara: g88 2/8 30
Saudi Arabia: g90 1/22 29
use of sewage: g05 6/22 28