未来人类需素食以避免食品短缺
<p>在斯德哥尔摩参加世界水大会的科学家们发布的一份报告称，未来40年全球人口可能要转成纯素食习惯才能避免食品短缺产生的灾难性影响。该报告指出，到2050年，全球人口有望达到90亿，如果人类继续目前的饮食习惯，届时地球上将没有足够的水资源供农作物生长来养活这些人。目前，人类从动物食品中获取的蛋白质占20%，到2050年，这一比例将可能下降至5%。研究人员指出，动物蛋白类食品消耗的水资源是素食食品的5到10倍，全球有三分之一的耕地都用来种植动物饲料。人类转向素食习惯不但可以节约水资源，还能让更多耕地真正用于粮食生产，应对食品危机。自今年6月以来，受美俄干旱以及亚洲降雨减少等因素影响，全球玉米和小麦价格已上涨了近50%，未来五年有可能出现一次全球性食品危机。</p><p><span word="Leading">Leading</span> <span word="water">water</span> <span word="scientists">scientists</span> <span word="have">have</span> <span word="issued">issued</span> <span word="one">one</span> <span word="of">of</span> <span word="the">the</span> <span word="sternest">sternest</span> <span word="warnings">warnings</span> <span word="yet">yet</span> <span word="about">about</span> <span word="global">global</span> <span word="food">food</span> <span word="supplies">supplies</span>, <span word="saying">saying</span> <span word="that">that</span> <span word="the">the</span> <span word="world">world</span>'<span word="s">s</span> <span word="population">population</span> <span word="may">may</span> <span word="have">have</span> <span word="to">to</span> <span word="switch">switch</span> <span word="almost">almost</span> <span word="completely">completely</span> <span word="to">to</span> <span word="a">a</span> <span word="vegetarian">vegetarian</span> <span word="diet">diet</span> <span word="over">over</span> <span word="the">the</span> <span word="next">next</span> 40 <span word="years">years</span> <span word="to">to</span> <span word="avoid">avoid</span> <span word="catastrophic">catastrophic</span> <span word="shortages">shortages</span>.</p><p><span word="Humans">Humans</span> <span word="derive">derive</span> <span word="about">about</span> 20% <span word="of">of</span> <span word="their">their</span> <span word="protein">protein</span> <span word="from">from</span> <span word="animal">animal</span>-<span word="based">based</span> <span word="products">products</span> <span word="now">now</span>, <span word="but">but</span> <span word="this">this</span> <span word="may">may</span> <span word="need">need</span> <span word="to">to</span> <span word="drop">drop</span> <span word="to">to</span> <span word="just">just</span> 5% <span word="to">to</span> <span word="feed">feed</span> <span word="the">the</span> <span word="extra">extra</span> 2 <span word="billion">billion</span> <span word="people">people</span> <span word="expected">expected</span> <span word="to">to</span> <span word="be">be</span> <span word="alive">alive</span> <span word="by">by</span> 2050, <span word="according">according</span> <span word="to">to</span> <span word="research">research</span> <span word="by">by</span> <span word="some">some</span> <span word="of">of</span> <span word="the">the</span> <span word="world">world</span>'<span word="s">s</span> <span word="leading">leading</span> <span word="water">water</span> <span word="scientists">scientists</span>.</p><p>"<span word="There">There</span> <span word="will">will</span> <span word="not">not</span> <span word="be">be</span> <span word="enough">enough</span> <span word="water">water</span> <span word="available">available</span> <span word="on">on</span> <span word="current">current</span> <span word="croplands">croplands</span> <span word="to">to</span> <span word="produce">produce</span> <span word="food">food</span> <span word="for">for</span> <span word="the">the</span> <span word="expected">expected</span> 9 <span word="billion">billion</span> <span word="population">population</span> <span word="in">in</span> 2050 <span word="if">if</span> <span word="we">we</span> <span word="follow">follow</span> <span word="current">current</span> <span word="trends">trends</span> <span word="and">and</span> <span word="changes">changes</span> <span word="towards">towards</span> <span word="diets">diets</span> <span word="common">common</span> <span word="in">in</span> <span word="western">western</span> <span word="nations">nations</span>," <span word="the">the</span> <span word="report">report</span> <span word="by">by</span> <span word="Malik">Malik</span> <span word="Falkenmark">Falkenmark</span> <span word="and">and</span> <span word="colleagues">colleagues</span> <span word="at">at</span> <span word="the">the</span> <span word="Stockholm">Stockholm</span> <span word="International">International</span> <span word="Water">Water</span> <span word="Institute">Institute</span> (<span word="SIWI">SIWI</span>) <span word="said">said</span>.</p>
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