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Chapter Page 1 THE EARTH ANSWERS BACK
ENERGY FROM EARTH TO MAN
As MANKIND THINKETH
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able acres Africa agriculture American animals areas become carrying capacity cause cent century China cities completely Conservation considerable continent corn course cover crop cultivated decades depend destroyed destruction earth ecological economic effective entire environment erosion especially Europe excessive exist extremely fact factors fall famine farm farmer feed fertility field floods forces forest give going human hundred important increase India industrial Italy land Latin less limited living living standard lower material means methods Mexico miles millions natural nearly North numbers organic period plant population possible probably problem production protect rain rainfall range rapidly reduced region relationship result rich rivers Service slopes soil standard supply thousand tion understanding United vegetation wealth western wind