想要打击城市犯罪?多种树吧
<p><span word="Can">Can</span> <span word="a">a</span> <span word="tree">tree</span> <span word="help">help</span> <span word="prevent">prevent</span> <span word="crime">crime</span>? <span word="It">It</span> <span word="just">just</span> <span word="might">might</span>. <span word="Two">Two</span> <span word="new">new</span> <span word="studies">studies</span>, <span word="led">led</span> <span word="by">by</span> <span word="US">US</span> <span word="Forest">Forest</span> <span word="Service">Service</span> <span word="researchers">researchers</span>, <span word="took">took</span> <span word="a">a</span> <span word="closer">closer</span> <span word="look">look</span> <span word="at">at</span> <span word="urban">urban</span> <span word="green">green</span> <span word="space">space</span> <span word="in">in</span> <span word="Philadelphia">Philadelphia</span>, <span word="Baltimore">Baltimore</span> <span word="and">and</span> <span word="Youngstown">Youngstown</span>, <span word="Ohio">Ohio</span>. <span word="In">In</span> <span word="each">each</span> <span word="of">of</span> <span word="these">these</span> <span word="cities">cities</span>, <span word="adding">adding</span> <span word="green">green</span> <span word="space">space</span> <span word="to">to</span> <span word="crime">crime</span>-<span word="ridden">ridden</span> <span word="areas">areas</span> <span word="helped">helped</span> <span word="reduce">reduce</span> <span word="crime">crime</span> <span word="rates">rates</span>, <span word="the">the</span> <span word="researchers">researchers</span> <span word="found">found</span>.</p><p>种树可以预防犯罪吗？有可能哦。美国林务局研究员做的两项最新研究仔细调查了费城、巴尔的摩和俄亥俄州扬斯敦的市区绿化情况。研究人员发现，在这三个城市中，在治安糟糕的区域增加绿化面积可以有效减少犯罪率。</p><p><span word="In">In</span> 2000, <span word="Philadelphia">Philadelphia</span> <span word="launched">launched</span> <span word="a">a</span> <span word="program">program</span> <span word="to">to</span> <span word="plant">plant</span> <span word="vegetation">vegetation</span> <span word="along">along</span> <span word="roadways">roadways</span> <span word="to">to</span> <span word="help">help</span> <span word="soak">soak</span> <span word="up">up</span> <span word="rainwater">rainwater</span>. <span word="Researchers">Researchers</span> <span word="looked">looked</span> <span word="at">at</span> 52 <span word="of">of</span> <span word="these">these</span> <span word="vegetation">vegetation</span> <span word="plots">plots</span> <span word="and">and</span> <span word="compared">compared</span> <span word="them">them</span> <span word="with">with</span> <span word="control">control</span> <span word="plots">plots</span> <span word="that">that</span> <span word="didn">didn</span>'<span word="t">t</span> <span word="receive">receive</span> <span word="the">the</span> <span word="greenery">greenery</span> <span word="upgrade">upgrade</span>. <span word="After">After</span> <span word="tracking">tracking</span> 14 <span word="types">types</span> <span word="of">of</span> <span word="crime">crime</span> <span word="in">in</span> <span word="nearby">nearby</span> <span word="areas">areas</span>, <span word="researchers">researchers</span> <span word="found">found</span> <span word="that">that</span> <span word="narcotics">narcotics</span> <span word="possession">possession</span> <span word="in">in</span> <span word="those">those</span> <span word="areas">areas</span> <span word="decreased">decreased</span> <span word="by">by</span> 18 <span word="to">to</span> 27 <span word="percent">percent</span>, <span word="even">even</span> <span word="as">as</span> <span word="the">the</span> <span word="rate">rate</span> <span word="for">for</span> <span word="the">the</span> <span word="rest">rest</span> <span word="of">of</span> <span word="the">the</span> <span word="city">city</span> <span word="rose">rose</span> <span word="by">by</span> 65 <span word="percent">percent</span>.</p><p>2000年，费城启动了一个项目，在道路两旁种植绿化带吸收雨水。研究者们观察了52处绿化点，与没有进行绿化改造的对照区进行对比。在追踪了附近14种犯罪手段之后，研究者发现，这些区域的毒品持有量下降到27%，下降了18个百分点，尽管这一数字在城市的其它地区还上涨了65个百分点。</p>
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