《The Precipice 》作者：- Ben Bova【EPUB】

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And? with? special? thanks? to? Jeff? Mitchell,? a? real? rocket? scientist;? to? Chris? Fountain,? metallurgist? and optimist;? and? to? Lee? Modesitt,? an? economist? with? imagination;? true? friends? all. ? The? modern? tropics? and? their? fringes? support? more? than? half? the? world's? population,? numbered? in? the billions.? Many? already? live? at? the? fringe? of? survival,? dependent? on? food? aid? transported? from? the? grain? belts of? more? temperate? zones.? Even? a? small? climatic? shift...? would? physically? compress? the? geographical? limits for? cereal? cropping....? I? leave? it? to? your? imagination? what? such? a? pace? of? climate? cha