美国：北极熊命运堪忧-英语点津
<p>美国：北极熊命运堪忧</p><p><span word="Most">Most</span> <span word="polar">polar</span> <span word="bears">bears</span> <span word="could">could</span> <span word="be">be</span> <span word="lost">lost</span> <span word="by">by</span> 2050</p><p>"<span word="There">There</span> <span word="is">is</span> <span word="a">a</span> <span word="definite">definite</span> <span word="link">link</span> <span word="between">between</span> <span word="changes">changes</span> <span word="in">in</span> <span word="the">the</span> <span word="sea">sea</span> <span word="ice">ice</span> <span word="and">and</span> <span word="the">the</span> <span word="welfare">welfare</span> <span word="of">of</span> <span word="polar">polar</span> <span word="bears">bears</span>," <span word="said">said</span> <span word="Steve">Steve</span> <span word="Amstrup">Amstrup</span>, <span word="who">who</span> <span word="led">led</span> <span word="the">the</span> <span word="research">research</span> <span word="team">team</span>. <span word="Arctic">Arctic</span> <span word="sea">sea</span> <span word="ice">ice</span> <span word="is">is</span> <span word="already">already</span> <span word="at">at</span> <span word="an">an</span> <span word="all">all</span>-<span word="time">time</span> <span word="low">low</span> <span word="this">this</span> <span word="year">year</span> <span word="and">and</span> <span word="is">is</span> <span word="expected">expected</span> <span word="to">to</span> <span word="retreat">retreat</span> <span word="farther">farther</span> <span word="this">this</span> <span word="month">month</span>, <span word="according">according</span> <span word="to">to</span> <span word="the">the</span> <span word="US">US</span> <span word="National">National</span> <span word="Snow">Snow</span> <span word="and">and</span> <span word="Ice">Ice</span> <span word="Data">Data</span> <span word="Center">Center</span>.</p><p><span word="That">That</span> <span word="means">means</span> <span word="that">that</span> <span word="polar">polar</span> <span word="bears">bears</span> -- <span word="some">some</span> 16,000 <span word="of">of</span> <span word="them">them</span> -- <span word="will">will</span> <span word="disappear">disappear</span> <span word="by">by</span> 2050 <span word="from">from</span> <span word="parts">parts</span> <span word="of">of</span> <span word="the">the</span> <span word="Arctic">Arctic</span> <span word="where">where</span> <span word="sea">sea</span> <span word="ice">ice</span> <span word="is">is</span> <span word="melting">melting</span> <span word="most">most</span> <span word="rapidly">rapidly</span>, <span word="along">along</span> <span word="the">the</span> <span word="north">north</span> <span word="coasts">coasts</span> <span word="of">of</span> <span word="Alaska">Alaska</span> <span word="and">and</span> <span word="Russia">Russia</span>, <span word="researchers">researchers</span> <span word="said">said</span>.</p><p><span word="Other">Other</span> <span word="polar">polar</span> <span word="bear">bear</span> <span word="populations">populations</span> <span word="could">could</span> <span word="survive">survive</span> <span word="beyond">beyond</span> <span word="that">that</span> <span word="date">date</span> <span word="but">but</span> <span word="many">many</span> <span word="of">of</span> <span word="those">those</span> <span word="could">could</span> <span word="be">be</span> <span word="gone">gone</span> <span word="by">by</span> 2100, <span word="Amstrup">Amstrup</span> <span word="said">said</span>. <span word="By">By</span> <span word="century">century</span>'<span word="s">s</span> <span word="end">end</span>, <span word="the">the</span> <span word="only">only</span> <span word="polar">polar</span> <span word="bears">bears</span> <span word="left">left</span> <span word="might">might</span> <span word="live">live</span> <span word="in">in</span> <span word="the">the</span> <span word="Canadian">Canadian</span> <span word="Arctic">Arctic</span> <span word="islands">islands</span> <span word="and">and</span> <span word="along">along</span> <span word="the">the</span> <span word="west">west</span> <span word="coast">coast</span> <span word="of">of</span> <span word="Greenland">Greenland</span>.</p><p>"<span word="Projected">Projected</span> <span word="changes">changes</span> <span word="in">in</span> <span word="future">future</span> <span word="sea">sea</span> <span word="ice">ice</span> <span word="conditions">conditions</span>, <span word="if">if</span> <span word="realized">realized</span>, <span word="will">will</span> <span word="result">result</span> <span word="in">in</span> <span word="loss">loss</span> <span word="of">of</span> <span word="approximately">approximately</span> <span word="two">two</span>-<span word="thirds">thirds</span> <span word="of">of</span> <span word="the">the</span> <span word="world">world</span>'<span word="s">s</span> <span word="current">current</span> <span word="polar">polar</span> <span word="bear">bear</span> <span word="population">population</span> <span word="by">by</span> <span word="the">the</span> <span word="mid">mid</span> 21<span word="st">st</span> <span word="century">century</span>," <span word="the">the</span> <span word="report">report</span>'<span word="s">s</span> <span word="executive">executive</span> <span word="summary">summary</span> <span word="said">said</span>.</p><p>"<span word="Because">Because</span> <span word="the">the</span> <span word="observed">observed</span> <span word="trajectory">trajectory</span> <span word="of">of</span> <span word="Arctic">Arctic</span> <span word="sea">sea</span> <span word="ice">ice</span> <span word="decline">decline</span> <span word="appears">appears</span> <span word="to">to</span> <span word="be">be</span> <span word="underestimated">underestimated</span> <span word="by">by</span> <span word="currently">currently</span> <span word="available">available</span> <span word="models">models</span>, <span word="this">this</span> <span word="assessment">assessment</span> <span word="of">of</span> <span word="future">future</span> <span word="polar">polar</span> <span word="bear">bear</span> <span word="status">status</span> <span word="may">may</span> <span word="be">be</span> <span word="conservative">conservative</span>."</p><p><span word="In">In</span> <span word="January">January</span>, <span word="the">the</span> <span word="US">US</span> <span word="Fish">Fish</span> <span word="and">and</span> <span word="Wildlife">Wildlife</span> <span word="Service">Service</span> <span word="proposed">proposed</span> <span word="listing">listing</span> <span word="the">the</span> <span word="polar">polar</span> <span word="bear">bear</span> <span word="as">as</span> <span word="a">a</span> <span word="threatened">threatened</span> <span word="species">species</span> <span word="under">under</span> <span word="the">the</span> <span word="Endangered">Endangered</span> <span word="Species">Species</span> <span word="Act">Act</span>, <span word="noting">noting</span> <span word="polar">polar</span> <span word="bears">bears</span> <span word="depended">depended</span> <span word="on">on</span> <span word="sea">sea</span> <span word="ice">ice</span> <span word="as">as</span> <span word="a">a</span> <span word="platform">platform</span> <span word="to">to</span> <span word="hunt">hunt</span> <span word="seals">seals</span>, <span word="their">their</span> <span word="main">main</span> <span word="prey">prey</span>.</p>
页:
[1]