Alien species are being introduced by human 
activities to all regions and biomes of the 
world at unprecedented rates. Some become 
invasive, causing negative and in some cases 
irreversible impacts on nature, including loss 
of uniqueness of biological communities, 
contributing to the unparalleled degree of 
deterioration of the biosphere upon which 
humanity depends.
 <Section-header> A. Invasive alien species are a 
major threat to nature, nature's 
contributions to people, and good 
quality of life </Section-header> 

SUMMARY FOR POLICYMAKERS
The thematic assessment report on
INVASIVE ALIEN SPECIES
AND THEIR CONTROL
A. Invasive alien species are a 
major threat to nature, nature's 
contributions to people, and good 
quality of life