Warmer, more crowded cities bring out the rats

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By Elizabeth Pennisi, Science. 

Excerpt: Climate change emerged as a driving factor behind urban rat swarms, the researchers report today in Science Advances. As temperatures rise, they conclude, and people flock to urban areas and convert formerly “green” spaces into neighborhoods and shopping centers, they created a perfect storm for rat populations to explode. And the city that’s fared the worst over the past decade? Washington, D.C..... 

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