全球变暖或引外星人毁灭地球？
<p><span word="The">The</span> <span word="first">first</span> <span word="spaceman">spaceman</span> <span word="to">to</span> <span word="land">land</span> <span word="on">on</span> <span word="Earth">Earth</span> <span word="may">may</span> <span word="not">not</span> <span word="be">be</span> <span word="as">as</span> <span word="friendly">friendly</span> <span word="as">as</span> <span word="ET">ET</span>。</p><p><span word="In">In</span> <span word="the">the</span> <span word="latest">latest</span> <span word="bid">bid</span> <span word="to">to</span> <span word="get">get</span> <span word="us">us</span> <span word="to">to</span> <span word="cut">cut</span> <span word="greenhouse">greenhouse</span> <span word="gases">gases</span>, <span word="scientists">scientists</span> <span word="have">have</span> <span word="decided">decided</span> <span word="that">that</span> <span word="eco">eco</span>-<span word="conscious">conscious</span> <span word="aliens">aliens</span> <span word="disgusted">disgusted</span> <span word="by">by</span> <span word="mankind">mankind</span>'<span word="s">s</span> <span word="emissions">emissions</span> <span word="could">could</span> <span word="destroy">destroy</span> <span word="our">our</span> <span word="planet">planet</span> <span word="in">in</span> <span word="disgust">disgust</span>。</p><p><span word="When">When</span> <span word="observed">observed</span> <span word="from">from</span> <span word="afar">afar</span>, <span word="the">the</span> <span word="changes">changes</span> <span word="in">in</span> <span word="Earth">Earth</span>'<span word="s">s</span> <span word="atmosphere">atmosphere</span> <span word="could">could</span> <span word="label">label</span> <span word="us">us</span> <span word="as">as</span> <span word="a">a</span> <span word="civilization">civilization</span> <span word="that">that</span> <span word="has">has</span> <span word="grown">grown</span> <span word="out">out</span> <span word="of">of</span> <span word="control">control</span>。</p><p><span word="Aliens">Aliens</span> <span word="reaching">reaching</span> <span word="that">that</span> <span word="conclusion">conclusion</span> <span word="may">may</span> <span word="then">then</span> <span word="launch">launch</span> <span word="a">a</span> <span word="pre">pre</span>-<span word="emptive">emptive</span> <span word="attack">attack</span> <span word="to">to</span> <span word="protect">protect</span> <span word="this">this</span> <span word="perceived">perceived</span> <span word="threat">threat</span> <span word="to">to</span> <span word="their">their</span> <span word="own">own</span> <span word="way">way</span> <span word="of">of</span> <span word="life">life</span>。</p><p>电影《<span word="ET">ET</span>》剧照</p><p><span word="But">But</span> <span word="that">that</span> <span word="is">is</span> <span word="only">only</span> <span word="one">one</span> <span word="possibility">possibility</span>. <span word="Scientists">Scientists</span> <span word="are">are</span> <span word="also">also</span> <span word="considering">considering</span> <span word="other">other</span> <span word="unwelcome">unwelcome</span> - <span word="and">and</span> <span word="far">far</span>-<span word="fetched">fetched</span> - <span word="outcomes">outcomes</span>, <span word="such">such</span> <span word="as">as</span> <span word="aggressive">aggressive</span> <span word="extra">extra</span>-<span word="terrestrials">terrestrials</span> <span word="who">who</span> <span word="eat">eat</span> <span word="or">or</span> <span word="enslave">enslave</span> <span word="us">us</span>, <span word="or">or</span> <span word="perhaps">perhaps</span> <span word="they">they</span> <span word="are">are</span> <span word="industrial">industrial</span> <span word="types">types</span> <span word="who">who</span> <span word="want">want</span> <span word="to">to</span> <span word="improve">improve</span> <span word="their">their</span> <span word="own">own</span> <span word="technological">technological</span> <span word="infrastructure">infrastructure</span> <span word="and">and</span> <span word="so">so</span> <span word="pillage">pillage</span> <span word="ours">ours</span>。</p><p><span word="Lead">Lead</span> <span word="researcher">researcher</span> <span word="Shawn">Shawn</span> <span word="Domagal">Domagal</span>-<span word="Goldman">Goldman</span> <span word="and">and</span> <span word="his">his</span> <span word="team">team</span> <span word="compiled">compiled</span> <span word="a">a</span> <span word="list">list</span> <span word="of">of</span> <span word="hypothetical">hypothetical</span> <span word="situations">situations</span> <span word="to">to</span> <span word="help">help</span> <span word="us">us</span> <span word="when">when</span> <span word="we">we</span> <span word="come">come</span> <span word="into">into</span> <span word="contact">contact</span> <span word="with">with</span> <span word="other">other</span> <span word="life">life</span> <span word="forms">forms</span>。</p><p><span word="Their">Their</span> <span word="suggestions">suggestions</span> <span word="include">include</span> <span word="the">the</span> <span word="issuing">issuing</span> <span word="of">of</span> <span word="warnings">warnings</span> <span word="against">against</span> <span word="broadcasts">broadcasts</span> <span word="that">that</span> <span word="might">might</span> <span word="help">help</span> <span word="aliens">aliens</span> <span word="from">from</span> <span word="learning">learning</span> <span word="about">about</span> <span word="our">our</span> <span word="biological">biological</span> <span word="make">make</span>-<span word="up">up</span>。</p><p><span word="The">The</span> <span word="first">first</span> <span word="part">part</span> <span word="of">of</span> <span word="our">our</span> <span word="contact">contact</span>, <span word="they">they</span> <span word="add">add</span>, <span word="should">should</span> <span word="be">be</span> <span word="limited">limited</span> <span word="to">to</span> <span word="maths">maths</span> <span word="until">until</span> <span word="we">we</span> <span word="have">have</span> <span word="a">a</span> <span word="better">better</span> <span word="idea">idea</span> <span word="of">of</span> <span word="the">the</span> <span word="type">type</span> <span word="of">of</span> <span word="ETI">ETI</span> <span word="we">we</span> <span word="are">are</span> <span word="dealing">dealing</span> <span word="with">with</span>。</p><p><span word="It">It</span> <span word="would">would</span> <span word="be">be</span> <span word="particularly">particularly</span> <span word="important">important</span> <span word="for">for</span> <span word="us">us</span> <span word="to">to</span> <span word="limit">limit</span> <span word="our">our</span> <span word="emissions">emissions</span> <span word="of">of</span> <span word="greenhouse">greenhouse</span> <span word="gases">gases</span>, <span word="since">since</span> <span word="atmospheric">atmospheric</span> <span word="composition">composition</span> <span word="can">can</span> <span word="be">be</span> <span word="observed">observed</span> <span word="from">from</span> <span word="other">other</span> <span word="planets">planets</span>。</p>
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