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="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（6月1日）发表的一项研究，这一切正在发生，比之前预期的要快得多，而且完全是人类造成的。</p>
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