Fishing grounds choked by water hyacinths. Songbird eggs gobbled up by rats. Power plant pipes clogged by zebra mussels. And electrical lines downed by brown tree snakes. These are just a few examples of the environmental chaos sown by invasive species, whose spread around the world has seen economic damages quadruple every decade since 1970, scientists said on Monday.
Invasive species cost global economy $423 bln per year – UN report
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