研究：第六次物种大灭绝进度比预想的快
<p>最新研究指出，地球第六次物种大灭绝正在发生，而且正在加速推进。科学家们担心，物种减少会对地球生态系统产生巨大影响，对人类的生存构成真正的威胁。</p><p> [<span word="Photo">Photo</span> <span word="by">by</span> <span word="Qi">Qi</span> <span word="Hongyan">Hongyan</span>/<span word="For">For</span> <span word="chinadaily">chinadaily</span>.<span word="com">com</span>.<span word="cn">cn</span>]</p><p><span word="The">The</span> <span word="sixth">sixth</span> <span word="mass">mass</span> <span word="extinction">extinction</span> <span word="is">is</span> <span word="not">not</span> <span word="a">a</span> <span word="worry">worry</span> <span word="for">for</span> <span word="the">the</span> <span word="future">future</span>. <span word="It">It</span>'<span word="s">s</span> <span word="happening">happening</span> <span word="now">now</span>, <span word="much">much</span> <span word="faster">faster</span> <span word="than">than</span> <span word="previously">previously</span> <span word="expected">expected</span>, <span word="and">and</span> <span word="it">it</span>'<span word="s">s</span> <span word="entirely">entirely</span> <span word="our">our</span> <span word="fault">fault</span>, <span word="according">according</span> <span word="to">to</span> <span word="a">a</span> <span word="study">study</span> <span word="published">published</span> <span word="Monday">Monday</span>.</p><p>第六次物种大灭绝并不是对未来的担忧。根据本周一<span word="Humans">Humans</span> <span word="have">have</span> <span word="already">already</span> <span word="wiped">wiped</span> <span word="out">out</span> <span word="hundreds">hundreds</span> <span word="of">of</span> <span word="species">species</span> <span word="and">and</span> <span word="pushed">pushed</span> <span word="many">many</span> <span word="more">more</span> <span word="to">to</span> <span word="the">the</span> <span word="brink">brink</span> <span word="of">of</span> <span word="extinction">extinction</span> <span word="through">through</span> <span word="wildlife">wildlife</span> <span word="trade">trade</span>, <span word="pollution">pollution</span>, <span word="habitat">habitat</span> <span word="loss">loss</span> <span word="and">and</span> <span word="the">the</span> <span word="use">use</span> <span word="of">of</span> <span word="toxic">toxic</span> <span word="substances">substances</span>. <span word="But">But</span> <span word="the">the</span> <span word="findings">findings</span> <span word="published">published</span> <span word="in">in</span> <span word="the">the</span> <span word="scientific">scientific</span> <span word="journal">journal</span> <span word="Proceedings">Proceedings</span> <span word="of">of</span> <span word="the">the</span> <span word="National">National</span> <span word="Academy">Academy</span> <span word="of">of</span> <span word="Sciences">Sciences</span> (<span word="PNAS">PNAS</span>) <span word="show">show</span> <span word="that">that</span> <span word="the">the</span> <span word="rate">rate</span> <span word="at">at</span> <span word="which">which</span> <span word="species">species</span> <span word="are">are</span> <span word="dying">dying</span> <span word="out">out</span> <span word="has">has</span> <span word="accelerated">accelerated</span> <span word="in">in</span> <span word="recent">recent</span> <span word="decades">decades</span>.</p><p>由于野生动植物贸易、污染、栖息地丧失和有毒物质的使用，人类已经导致数以百计的物种消失，并将更多的物种推向灭绝的边缘。发表在《美国国家科学院院刊》上的研究结果表明，近几十年来，物种灭绝的速度已在加快。</p><p><span word="Gerardo">Gerardo</span> <span word="Ceballos">Ceballos</span> <span word="Gonz">Gonz</span>á<span word="lez">lez</span>, <span word="a">a</span> <span word="professor">professor</span> <span word="of">of</span> <span word="ecology">ecology</span> <span word="at">at</span> <span word="the">the</span> <span word="National">National</span> <span word="Autonomous">Autonomous</span> <span word="University">University</span> <span word="of">of</span> <span word="Mexico">Mexico</span> <span word="and">and</span> <span word="one">one</span> <span word="of">of</span> <span word="the">the</span> <span word="authors">authors</span> <span word="of">of</span> <span word="the">the</span> <span word="study">study</span>, <span word="said">said</span> <span word="approximately">approximately</span> 173 <span word="species">species</span> <span word="went">went</span> <span word="extinct">extinct</span> <span word="between">between</span> 2001 <span word="and">and</span> 2017.</p><p>墨西哥国立自治大学的生态学教授杰拉尔多·塞巴罗斯·冈萨雷斯是这项研究的作者之一。他说，在2001年至2017年间，大约有173个物种灭绝了。</p>
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