Update on the environmental and economic costs associated with alien-invasive species in the United States
Pimentel, David
,
Zuniga, Rodolfo
,
Morrison, Doug
2004
Invading alien species in the United States cause major environmental damages and losses adding up to almost $120 billion per year. There are approximately 50,000 foreign species and the number is increasing. About 42% of the species on the Threatene