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Show Woise WOlse Drouths Droutlls Would WouldEmpty WouldEmpty Empty Feitile Fel tile Regions RegionsDenver RegionsDenver DenverWith Denver -With With - With climatic cl1matic changes changeslarger changeslarger changeslarger larger than those that brought the thedrouths thedrouths thedrouths . drouths and windstorms wlndstorms ot of the past pastfew pastfew few 5 y ) ears , there thero would be a migra migra- migratIon migration migration - - I migraI tion ot of man from the fertile fertiIe parts of ofI ofthe ofthe I the nation nabon where he now lives I1ves . , Dr Dr.M DrM . 1M ltif M Leighton , chief of the UIC IllInoIs IllInoIsstate Illinoisstate Illinoisstate . state geological survey , predicted prcdJcted to tothe tothe the meeting here of the American AmericanAssocIatIon AmericanAssociation AmericanAssociation AssocIatIon for the Advancement of ofScience ofScience ofScienceBut : Science ScienceBut But a n more immediate problem problemthan problemthan problemthan than a Do possible return of the gla- gla glacial glacial gla glacial - cial period is 15 the preventing of the thedrJ.ft thedrift thedrift drJ.ft drJft drift . of America's Americas ' fertile so soils s Even Evenmldwestcrn Evenmidwestern Evenmidwcstcrn mldwestcrn midwestern farmers must conserveand conserve conserveand conserveand and protect their greatest natural naturalresource naturalresource naturalresource resource , he warned Dust storms stormstake stormstake stormstake take place even in m a moist chmate climate climateif 1 if ! bare areas are exposed cII.posed cIIposed : . to the thewind thewind thewind wind In more and arId regions the bal- bal balante bal bal- balance balance - ance ante between erosion and vegeta vegeta- vegetation vegetation vegetation - tion is so critical that man must mustactIvely mustactively mustactively actIvely aid nature |