研究：气候变化将使北极熊在本世纪末灭绝
<p>近几年我们经常从资讯上看到饿得皮包骨头的北极熊，因为气候变暖、海冰消融，靠浮冰捕食海豹为生的北极熊长期找不到食物，甚至沦落到去垃圾堆里翻找东西吃。然而更可悲的是，如今科学家的新研究发现，北极熊很可能撑不过这个世纪了。</p><p> 图片<span word="Climate">Climate</span> <span word="change">change</span> <span word="is">is</span> <span word="starving">starving</span> <span word="polar">polar</span> <span word="bears">bears</span> <span word="into">into</span> <span word="extinction">extinction</span>, <span word="according">according</span> <span word="to">to</span> <span word="research">research</span> <span word="published">published</span> <span word="Monday">Monday</span> <span word="that">that</span> <span word="predicts">predicts</span> <span word="the">the</span> <span word="apex">apex</span> <span word="carnivores">carnivores</span> <span word="could">could</span> <span word="all">all</span> <span word="but">but</span> <span word="disappear">disappear</span> <span word="within">within</span> <span word="the">the</span> <span word="span">span</span> <span word="of">of</span> <span word="a">a</span> <span word="human">human</span> <span word="lifetime">lifetime</span>. <span word="In">In</span> <span word="some">some</span> <span word="regions">regions</span> <span word="they">they</span> <span word="are">are</span> <span word="already">already</span> <span word="caught">caught</span> <span word="in">in</span> <span word="a">a</span> <span word="vicious">vicious</span> <span word="downward">downward</span> <span word="spiral">spiral</span>, <span word="with">with</span> <span word="shrinking">shrinking</span> <span word="sea">sea</span> <span word="ice">ice</span> <span word="cutting">cutting</span> <span word="short">short</span> <span word="the">the</span> <span word="time">time</span> <span word="bears">bears</span> <span word="have">have</span> <span word="for">for</span> <span word="hunting">hunting</span> <span word="seals">seals</span>, <span word="scientists">scientists</span> <span word="reported">reported</span> <span word="in">in</span> <span word="Nature">Nature</span> <span word="Climate">Climate</span> <span word="Change">Change</span>.</p><p>周一发布的一项研究称，气候变化正在饿死北极熊并迫使它们灭绝。该研究预测，北极熊这一食物链顶端的食肉动物可能会在百年内几近灭绝。科学家在《自然气候变化》上发表的报告称，在部分地区，由于海冰消融缩短了北极熊捕食海豹的时间，北极熊已经陷入数量螺旋式下降的恶性循环。</p><p><span word="all">all</span> <span word="but">but</span>: 几乎，差一点</p><p><span word="Their">Their</span> <span word="dwindling">dwindling</span> <span word="body">body</span> <span word="weight">weight</span> <span word="undermines">undermines</span> <span word="their">their</span> <span word="chances">chances</span> <span word="of">of</span> <span word="surviving">surviving</span> <span word="Arctic">Arctic</span> <span word="winters">winters</span> <span word="without">without</span> <span word="food">food</span>, <span word="the">the</span> <span word="scientists">scientists</span> <span word="added">added</span>.</p><p>科学家补充道，因为体重不断下降，北极熊在没有食物的情况下熬过北极冬天的几率降低了。</p><p>"<span word="The">The</span> <span word="bears">bears</span> <span word="face">face</span> <span word="an">an</span> <span word="ever">ever</span> <span word="longer">longer</span> <span word="fasting">fasting</span> <span word="period">period</span> <span word="before">before</span> <span word="the">the</span> <span word="ice">ice</span> <span word="refreezes">refreezes</span> <span word="and">and</span> <span word="they">they</span> <span word="can">can</span> <span word="head">head</span> <span word="back">back</span> <span word="out">out</span> <span word="to">to</span> <span word="feed">feed</span>," <span word="Steven">Steven</span> <span word="Amstrup">Amstrup</span>, <span word="who">who</span> <span word="conceived">conceived</span> <span word="the">the</span> <span word="study">study</span> <span word="and">and</span> <span word="is">is</span> <span word="chief">chief</span> <span word="scientist">scientist</span> <span word="of">of</span> <span word="Polar">Polar</span> <span word="Bears">Bears</span> <span word="International">International</span>, <span word="told">told</span> <span word="AFP">AFP</span>.</p>
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