回到上新世？气候变化或让南极洲变“绿洲”
<p>科学家警告，如果再不采取行动，南极洲的皑皑白雪将被绿色植被所取代。上一次出现“南极绿洲”是在300万年前的上新世时期。如果人类还是无动于衷，那么到2100年，地球将回归恐龙时代的状态。</p><p><span word="Man">Man</span>-<span word="made">made</span> <span word="climate">climate</span> <span word="change">change</span> <span word="could">could</span> <span word="turn">turn</span> <span word="Antarctica">Antarctica</span> <span word="green">green</span>, <span word="with">with</span> <span word="plants">plants</span> <span word="colonising">colonising</span> <span word="the">the</span> <span word="land">land</span> <span word="as">as</span> <span word="ice">ice</span> <span word="sheets">sheets</span> <span word="shrink">shrink</span>, <span word="scientists">scientists</span> <span word="have">have</span> <span word="warned">warned</span>.</p><p>科学家警告说，人为的气候变化可能会让南极洲“变绿”，随着冰川消退，南极洲大陆上将会被植被覆盖。</p><p><span word="Experts">Experts</span> <span word="believe">believe</span> <span word="clues">clues</span> <span word="about">about</span> <span word="the">the</span> <span word="future">future</span> <span word="of">of</span> <span word="the">the</span> <span word="planet">planet</span> <span word="can">can</span> <span word="be">be</span> <span word="gleaned">gleaned</span> <span word="from">from</span> <span word="the">the</span> <span word="Pliocene">Pliocene</span> <span word="period">period</span> <span word="three">three</span> <span word="million">million</span> <span word="years">years</span> <span word="ago">ago</span>, <span word="the">the</span> <span word="last">last</span> <span word="time">time</span> <span word="carbon">carbon</span> <span word="dioxide">dioxide</span> <span word="levels">levels</span> <span word="in">in</span> <span word="the">the</span> <span word="atmosphere">atmosphere</span> <span word="were">were</span> <span word="as">as</span> <span word="high">high</span> <span word="as">as</span> <span word="they">they</span> <span word="are">are</span> <span word="today">today</span>.</p><p>专家认为，地球未来演变的趋势可以从300万年前的上新世时期找到线索，当时地球大气中的二氧化碳水平和现在一样高。</p><p><span word="glean">glean</span>[ɡ<span word="lin">lin</span>]: <span word="v">v</span>. 收集</p><p><span word="Carbon">Carbon</span> <span word="dioxide">dioxide</span> <span word="levels">levels</span> <span word="in">in</span> <span word="the">the</span> <span word="atmosphere">atmosphere</span> <span word="reached">reached</span> 400 <span word="parts">parts</span> <span word="per">per</span> <span word="million">million</span> (<span word="ppm">ppm</span>) <span word="on">on</span> <span word="average">average</span> <span word="in">in</span> 2017 <span word="for">for</span> <span word="the">the</span> <span word="first">first</span> <span word="time">time</span> <span word="since">since</span> <span word="records">records</span> <span word="began">began</span>, <span word="World">World</span> <span word="Meteorological">Meteorological</span> <span word="Organisation">Organisation</span> <span word="figures">figures</span> <span word="show">show</span>.</p><p>世界气象组织的数据显示，2017年大气中的二氧化碳平均水平达到了百万分之400，是有记录以来的最高水平。</p><p><span word="There">There</span> <span word="is">is</span> <span word="likely">likely</span> <span word="to">to</span> <span word="be">be</span> <span word="a">a</span> “<span word="lag">lag</span>” <span word="before">before</span> <span word="the">the</span> <span word="true">true</span> <span word="effects">effects</span> <span word="of">of</span> <span word="reaching">reaching</span> <span word="such">such</span> <span word="a">a</span> <span word="threshold">threshold</span> <span word="are">are</span> <span word="felt">felt</span>, <span word="Professor">Professor</span> <span word="Martin">Martin</span> <span word="Siegert">Siegert</span>, <span word="co">co</span>-<span word="director">director</span> <span word="of">of</span> <span word="the">the</span> <span word="Grantham">Grantham</span> <span word="Institute">Institute</span> <span word="at">at</span> <span word="Imperial">Imperial</span> <span word="College">College</span> <span word="said">said</span>.</p>
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