Today, 7000 invasive species are already in the USA, outcompeting or eating their native cousins, killing crops and forests, upsetting nature's delicate balance. They're blamed for four in 10 endangered-species listings, and their economic toll is staggering: $137 billion a year, estimates one study. Little wonder that the General Accounting Office has labeled invasive species "one of the most serious yet least-appreciated environmental threats of the 21st century."
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Can They Be Stopped?
Invasive Species - gateway to Federal and State invasive species activities and programs
Nature Conservancy - Invasive Species Initiative