Invasive species a growing and costly threat, key report to find

Invasive species that destroy forests, ravage crops and cause extinctions are a major and growing threat worldwide, a landmark UN-backed assessment is poised to report.  From water hyacinth choking Lake Victoria in East Africa, to rats and brown snakes wiping out bird species in the Pacific, to mosquitoes exposing new regions to Zika, yellow fever, […]

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