The Department of Agriculture this week updated its list of the top 15 most invasive creatures in the U.S. that cost billions of dollars in ruined crops. Combating them requires a "sea change" in how Americans think about the environment, says Scott Pfister, a director of the pest management department at the USDA. "We need to get Americans to start thinking about how these pests are moving around the country," Pfister said. "April's the time of year when people start to go camping and hiking and work in their gardens, so it's a very appropriate time to address this national problem."
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